Which of the circuit symbols means a 'meter for measuring current'? [7j-1]
sym07
sym27
sym06
sym19
Which of the circuit symbols means a 'meter for measuring potential difference'? [7j-2]
sym07
sym27
sym06
sym19
Which of the circuit symbols means a 'light bulb or lamp'? [7j-3]
sym07
sym27
sym06
sym19
Which of the circuit symbols means 'two cells or batteries in series'? [7j-4]
sym10
sym14
sym18
sym11
Which of the circuit symbols means a 'switch 'on''? [7j-5]
sym08
sym09
sym18
sym10
Which of the circuit symbols means a 'switch 'off''? [7j-6]
sym08
sym09
sym18
sym10
Which of the circuit symbols means a 'switch closed'? [7j-7]
sym18
sym10
sym08
sym09
Which of the circuit symbols means a 'switch open'? [7j-8]
sym08
sym10
sym18
sym09
Which of the circuit symbols means a 'two way switch'? [7j-9]
sym14
sym18
sym29
sym02
Which of the circuit symbols means 'two cells or batteries in parallel'? [7j-10]
sym11
sym28
sym30
sym29
Which of the circuit symbols means 'two bulbs or lamps in series'? [7j-11]
sym11
sym28
sym30
sym29
Which of the circuit symbols means 'two bulbs or lamps in parallel'? [7j-12]
sym11
sym28
sym30
sym29
From the four circuits shown, 'in which two will the bulb/bulbs be the same brightness'? Note that the bulbs are identical and the batteries identical. [7j-13]
circuit 01 and circuit 05
circuit 01 and circuit 04
circuit 04 and circuit 05
circuit 05 and circuit 07
From the four circuits shown, 'in which will the bulb/bulbs be the dimmest'? Note that the bulbs are identical and the batteries identical. [7j-14]
circuit 01
circuit 04
circuit 05
circuit 07
From the four circuits shown, 'in which will the bulb or bulbs be the brightest'? Note that the bulbs are identical and the batteries identical. [7j-15]
circuit 01
circuit 04
circuit 07
circuit 05
From the four circuits shown, in which two 'will the lamps be the same brightness'? Note that the bulbs are identical and the batteries identical. [7j-16]
circuit 09 and circuit 16
circuit 07 and circuit 09
circuit 03 and circuit 07
circuit 03 and circuit 16
From the four circuits shown, which will have 'the brightest lit lamp or lamps'? Note that the bulbs are identical and the batteries identical. [7j-17]
circuit 07
circuit 09
circuit 03
circuit 16
From the four circuits shown, which will have 'the dimmest lit bulb or bulbs'? Note that the bulbs are identical and the batteries identical. [7j-18]
circuit 07
circuit 09
circuit 03
circuit 16
From the four circuits shown, in which two 'will the lamps be the same brightness'? Note that the bulbs are identical and the batteries identical. [7j-19]
circuit 04 and circuit 06
circuit 06 and circuit 08
circuit 04 and circuit 17
circuit 08 and circuit 17
From the four circuits shown, which will have 'the brightest lit bulb or bulbs'? Note that the bulbs are identical and the batteries identical. [7j-20]
circuit 08
circuit 04
circuit 17
circuit 06
From the four circuits shown, which will have 'the dimmest lit bulb or bulbs'? Note that the bulbs are identical and the batteries identical. [7j-21]
circuit 08
circuit 04
circuit 17
circuit 06
In the context of electrical circuits, which words means 'does not readily allow the passage of electricity'? [7j-22]
insulator
conductor
voltmeter
ammeter
In the context of electrical circuits, which words means 'readily allows the passage of electricity'? [7j-23]
insulator
conductor
voltmeter
ammeter
In the context of electrical circuits, which words means an 'instrument that measures electrical force'? [7j-24]
insulator
conductor
voltmeter
ammeter
In the context of electrical circuits, which words means an 'instrument that measures electrical current'? [7j-25]
insulator
conductor
voltmeter
ammeter
In the context of electrical circuits, which of the following symbols means a 'variable resistor'? [7j-26]
sym21
sym05
sym04
sym13
In the context of electrical circuits, which of the following symbols means a 'fixed resistor'? [7j-27]
sym21
sym05
sym04
sym13
In the context of electrical circuits, which of the following symbols means a 'fuse'? [7j-28]
sym21
sym05
sym04
sym13
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-29]
in circuit 11 the bulbs are wired in parallel, but not so in circuit 12
if switch s2 is opened in both circuits, all the bulbs go out
the bulbs are dimmer in circuit 11 than the bulbs in circuit 12
the bulbs are brighter in circuit 12 than the bulbs in circuit 11
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-30]
if switch s2 is opened in both circuits, all the bulbs go out
in circuit 12 the bulbs are wired in series, but not in circuit 11
the bulbs are dimmer in circuit 11 than the bulbs in circuit 12
the bulbs are brighter in circuit 12 than the bulbs in circuit 11
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-31]
the bulbs in circuit 11 are wired in series
the bulbs in circuit 12 are wired in parallel
in circuit 11 the bulbs will be brighter than in circuit 12
the bulbs are dimmer in circuit 11 than the bulbs in circuit 12
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-32]
the bulbs in circuit 11 are wired in series
the bulbs in circuit 12 are wired in parallel
the bulbs are brighter in circuit 12 than the bulbs in circuit 11
in circuit 12 the bulbs will be dimmer than in circuit 11
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-33]
if switch s2 is opened in both circuits, all the bulbs go out in circuit 12 and only bulb b2 in circuit 11
if switch s2 is opened in both circuits, all the bulbs go out in circuit 11 and only bulb b1 in circuit 12
if ammeter a3 reads 0.4A in both circuits, ammeter a2 reads 0.4A in circuit 11 and ammeter a2 reads 0.2A in circuit 12
if ammeter a3 reads 0.4A in both circuits, ammeter a1 reads 0.4A in circuit 11 and ammeter a1 reads 0.2A in circuit 12
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-34]
if switch s2 is opened in both circuits, all the bulbs go out in circuit 11 and only bulb b1 in circuit 12
if switch s3 is opened in both circuits, all the bulbs go out in both circuits
if ammeter a3 reads 0.4A in both circuits, ammeter a2 reads 0.4A in circuit 11 and ammeter a2 reads 0.2A in circuit 12
if ammeter a3 reads 0.4A in both circuits, ammeter a1 reads 0.4A in circuit 11 and ammeter a1 reads 0.2A in circuit 12
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-35]
if switch s2 is opened in both circuits, all the bulbs go out in circuit 11 and only bulb b1 in circuit 12
if ammeter a3 reads 0.4A in both circuits, ammeter a2 reads 0.4A in circuit 11 and ammeter a2 reads 0.2A in circuit 12
if ammeter a3 reads 0.4A in both circuits, ammeter a2 reads 0.2A in circuit 11 and ammeter a2 reads 0.4A in circuit 12
if ammeter a3 reads 0.4A in both circuits, ammeter a1 reads 0.4A in circuit 11 and ammeter a1 reads 0.2A in circuit 12
Which of the following is TRUE when comparing the two circuits 11 and 12? Note that the bulbs are identical and the batteries identical. [7j-36]
if switch s2 is opened in both circuits, all the bulbs go out in circuit 11 and only bulb b1 in circuit 12
if ammeter a3 reads 0.4A in both circuits, ammeter a2 reads 0.4A in circuit 11 and ammeter a2 reads 0.2A in circuit 12
if ammeter a3 reads 0.4A in both circuits, ammeter a1 reads 0.4A in circuit 11 and ammeter a1 reads 0.2A in circuit 12
if ammeter a3 reads 0.4A in both circuits, ammeter a1 reads 0.2A in circuit 11 and ammeter a1 reads 0.4A in circuit 12
Which of the following is a unit of electrical force shown on a battery? [7j-37]
volts
amps
joules
coulombs
Which of the following is a unit of current? [7j-38]
volts
amps
joules
coulomb
Which of the following is a unit of energy? [7j-39]
volts
amps
joules
coulomb
Which of the following is a unit of fuse rating? [7j-40]
volts
coulombs
joules
amps
Circuit 18 shows how three lamps and four ammeters are wired together. All the lamps are identical and all four switches are closed. If ammeter a4 reads 12A, what will be the current reading on ammeter a2? [7j-41]
4A
8A
12A
3A
Circuit 18 shows how three lamps and four ammeters are wired together. All the lamps are identical and all four switches are closed. If ammeter a1 reads 3A, what will be the current reading on ammeter a4? [7j-42]
3A
9A
6A
1A
Circuit 18 shows how three lamps and four ammeters are wired together. The lamps are NOT identical but all four switches are closed. If ammeter a4 reads 8A, a1 reads 3A and a2 reads 2A, what will be the current reading on ammeter a3? [7j-43]
1A
2A
3A
4A
Circuit 18 shows how three lamps and four ammeters are wired together. The lamps are NOT identical but all four switches are closed. If ammeter a1 reads 2A, a2 reads 1A and a3 reads 4A, what will be the current reading on ammeter a4? [7j-44]
4A
6A
5A
7A
Which statement about electricity and circuits is TRUE? [7j-45]
the conventional current flows from + to -
a circuit does not have to be complete for a current to flow
to be effective cells must be connected + to + and - to -
more bulbs wired in series decreases the total resistance
Which statement about electricity and circuits is TRUE? [7j-46]
the conventional current flows from + to +
the circuit must be complete for a current to flow
to be effective cells must be connected + to + and - to -
more bulbs wired in parallel increases the total resistance
Which statement about electricity and circuits is TRUE? [7j-47]
the conventional current flows from - to -
the circuit does not have to be complete for a current to flow
to be effective cells must be connected + to - and + to -
more bulbs wired in series decreases the total resistance
Which statement about electricity and circuits is TRUE? [7j-48]
the conventional current flows from - to +
the circuit does not have to be complete for a current to flow
to be effective cells must be connected + to + and - to -
more bulbs wired in series increases the total resistance
Which statement about electricity and circuits is TRUE? [7j-49]
a battery or cell is a supply of electrical energy
bulbs wired in parallel increase the total resistance
for a current to flow a switch must be open
in copper wire electrical current is a flow of positive protons
Which statement about electricity and circuits is TRUE? [7j-50]
a battery or cell is a supply of chemical energy
bulbs wired in parallel decrease the total resistance
for a current to flow a switch must be open
in copper wire electrical current is a flow of positive protons
Which statement about electricity and circuits is TRUE? [7j-51]
a battery or cell is a supply of heat energy
bulbs wired in parallel increase the total resistance
for a current to flow a switch must be closed
in copper wire electrical current is a flow of positive protons
Which statement about electricity and circuits is TRUE? [7j-52]
a battery or cell is a supply of kinetic energy
bulbs wired in parallel increase the total resistance
for a current to flow a switch must be open
in a copper wire an electrical current is a flow of negative electrons
Circuit 19 shows a switch closed, battery, bulb and a variable resistor wired in a complete series circuit. Which statement about the operation of the circuit is TRUE? [7j-53]
if the resistance is decreased, more current flows and the bulb is brighter
if the resistance is increased less current flows and the bulb cannot light up
if the cell or battery connections are swapped around, the bulb goes out
the variable resistor cannot be used to control the lamp brightness
Circuit 19 shows a switch closed, battery, bulb and a variable resistor wired in a complete series circuit. Which statement about the operation of the circuit is TRUE? [7j-54]
if the resistance is decreased, less current flows and the bulb is brighter
if the resistance is increased less current flows and the bulb is dimmer
if the cell or battery connections are swapped around, the bulb goes out
the variable resistor cannot be used to control the lamp brightness
Circuit 19 shows a switch closed, battery, bulb and a variable resistor wired in a complete series circuit. Which statement about the operation of the circuit is TRUE? [7j-55]
if the resistance is decreased, less current flows and the bulb is dimmer
if the resistance is increased more current flows and the bulb burns out
if the cell or battery connections are swapped around, the bulb still lights
the variable resistor cannot be used to control the lamp brightness
Circuit 19 shows a switch closed, battery, bulb and a variable resistor wired in a complete series circuit. Which statement about the operation of the circuit is TRUE? [7j-56]
if the resistance is decreased, less current flows and the bulb is brighter
if the resistance is increased more current flows and the bulb burns out
if the cell or battery connections are swapped around, the bulb goes out
the variable resistor can be used to control the lamp brightness
Circuit 20 shows a circuit arrangement for five switches (s) and six bulbs (b). Which bulbs light up if switch s5 is closed? [7j-57]
b1 only
b1 and b6
b1, b2, b3 and b6
b1, b5 and b6
Circuit 20 shows a circuit arrangement for five switches (s) and six bulbs (b). Which bulbs light up if switches s1, s3 and s5 are closed? [7j-58]
b1, b2 and b5
b1, b2, b3 and b6
b1, b2, b4 and b6
b1, b2, b4, b5 and b6
Circuit 20 shows a circuit arrangement for five switches (s) and six bulbs (b). Which bulbs light up if switches s1, s2 and s5 are closed? [7j-59]
b1, b2, b5 and b6
b1, b2, b3 and b6
b1, b2, b4 and b6
b1, b2, b4, b5 and b6
Circuit 20 shows a circuit arrangement for five switches (s) and six bulbs (b). Which bulbs light up if switches s1, s2, s4 and s5 are closed? [7j-60]
b1, b2, b5 and b6
b1, b2, b3 and b6
b1, b2, b4 and b6
b1, b2, b4, b5 and b6
Circuit 20 shows a circuit arrangement for five switches (s) and six bulbs (b). Which bulbs light up if switches s1, s3, s4 and s5 are closed? [7j-61]
b1, b2, b3, b5 and b6
b1, b2, b3 and b6
b1, b2, b4 and b6
b1, b2, b4, b5 and b6
Circuit 21 shows the arrangement of six identical bulbs (X) and four ammeters (a1 to a4). To solve the problem you need to realise that each bulb has an identical resistance. The more bulbs there are in series, the greater the resistance to current flow. If a1 reads 3A and a4 reads 5.5A what will ammeter a2 read? [7j-62]
1.0A
1.5A
2.0A
0.5A
Circuit 21 shows the arrangement of six identical bulbs (X) and four ammeters (a1 to a4). To solve the problem you need to realise that each bulb has an identical resistance. The more bulbs there are in series, the greater the resistance to current flow. If a1 reads 6A and a2 reads 3A what will ammeter a4 read? [7j-63]
12A
10A
11A
9A
Circuit 21 shows the arrangement of six identical bulbs (X) and four ammeters (a1 to a4). To solve the problem you need to realise that each bulb has an identical resistance. The more bulbs there are in series, the greater the resistance to current flow. If a2 reads 4.5A and a3 reads 3.0A what will ammeter a1 read? [7j-64]
6.0A
7.5A
1.5A
9.0A
The ratings for four typical domestic appliance fuses are given below. Which is the safest fuse to use for an appliance with a normal operating current of 1.5A? [7j-65]
3A
5A
8A
13A
The ratings for four typical domestic appliance fuses are given below. Which is the safest fuse to use for an appliance with a normal operating current of 5A? [7j-66]
3A
8A
5A
13A
The ratings for four typical domestic appliance fuses are given below. Which is the safest fuse to use for an appliance with a normal operating current of 8A? [7j-67]
3A
5A
13A
8A
The ratings for four typical domestic appliance fuses are given below. Which is the safest fuse to use for an appliance with a normal operating current of 10A? [7j-68]
3A
5A
8A
13A
The ratings for four typical domestic appliance fuses are 3A, 5A, 8A and 13A. Which fuse wires will melt if a current of 4A is passed through them? [7j-69]
3A only
3A and 5A only
3A, 5A and 8A only
3A, 5A, 8A and 13A
The ratings for four typical domestic appliance fuses are 3A, 5A, 8A and 13A. Which fuse wires will melt if a current of 6A is passed through them? [7j-70]
3A only
3A and 5A only
3A, 5A and 8A only
3A, 5A, 8A and 13A
The ratings for four typical domestic appliance fuses are 3A, 5A, 8A and 13A. Which fuse wires will melt if a current of 9A is passed through them? [7j-71]
3A only
3A and 5A only
3A, 5A and 8A only
3A, 5A, 8A and 13A
The ratings for four typical domestic appliance fuses are 3A, 5A, 8A and 13A. Which fuse wires will melt if a current of 14A is passed through them? [7j-72]
3A only
3A and 5A only
3A, 5A and 8A only
3A, 5A, 8A and 13A
The Circuit 22 shows two, two way switches, s1 and s2, connected to a power supply and lamp. Which conditions ensure the lamp is ON in Circuit 22? [7j-73]
s1a closed (up) and s2b open (up)
s1b open (up) and s2a open (down)
s1a open (down) and s2a closed (up)
s1b closed (down) and s2b open (up)
The Circuit 22 shows two, two way switches, s1 and s2, connected to a power supply and lamp. Which conditions ensure the lamp is OFF in Circuit 22? [7j-74]
s1a closed (up) and s2b open (up)
s1b open (up) and s2a open (down)
s1b open (up) and s2a closed (up)
s1a open (down) and s2b closed (down)
The Circuit 22 shows two, two way switches, s1 and s2, connected to a power supply and lamp. Which conditions ensure the lamp is OFF in Circuit 22? [7j-75]
s1b closed (down) and s2a open (down)
s1b open (up) and s2a closed (up)
s1a open (down) and s2a closed (up)
s1a open (down) and s2b closed (down)
The Circuit 22 shows two, two way switches, s1 and s2, connected to a power supply and lamp. Which conditions ensure the lamp is ON in Circuit 22? [7j-76]
s1a closed (up) and s2a open (down)
s1a closed (up) and s2b closed (down)
s1a open (down) and s2a closed (up)
s1a open (down) and s2b closed (down)
The Circuit 23 shows a two way switch s1 and a simple switch s2, connected to a power supply and five lamps (b1 to b5). Which lamps will be ON when only switch s1a is closed (up)? [7j-77]
b2 and b3
b1 and b4
b1, b2, b3 and b5
b1, b2, b4 and b5
The Circuit 23 shows a two way switch s1 and a simple switch s2, connected to a power supply and five lamps (b1 to b5). Which lamps will be ON when only switch s1b is closed (down)? [7j-78]
b2 and b3
b1 and b4
b1, b2, b3 and b5
b1, b2, b4 and b5
The Circuit 23 shows a two way switch s1 and a simple switch s2, connected to a power supply and five lamps (b1 to b5). Which lamps will be ON when switches s1a and s2 are closed? [7j-79]
b2 and b3
b1 and b4
b1, b2, b3 and b5
b1, b2, b4 and b5
The Circuit 23 shows a two way switch s1 and a simple switch s2, connected to a power supply and five lamps (b1 to b5). Which lamps will be ON when switches s1b and s2 are closed? [7j-80]
b2 and b3
b1 and b4
b1, b2, b3 and b5
b1, b2, b4 and b5
Which statement is TRUE about mains electricity in the house? [7j-81]
the voltage is much bigger than a torch battery
wet skin has a bigger resistance than dry skin
the current flow is usually similar to triple batteries in a torch
a fuse allows a much higher than normal current to flow safely
Which statement is TRUE about mains electricity in the house? [7j-82]
the voltage is a little bigger than a torch battery
wet skin has a lower resistance than dry skin
the current flow is usually similar to triple batteries in a torch
a fuse allows a much higher than normal current to flow safely
Which statement is TRUE about mains electricity in the house? [7j-83]
the voltage is a little bigger than a torch battery
wet skin has a bigger resistance than dry skin
the current flow is usually big compared to a torch battery
a fuse allows a much higher than normal current to flow safely
Which statement is TRUE about mains electricity in the house? [7j-84]
the voltage is a little bigger than a torch battery
wet skin has a bigger resistance than dry skin
the current flow is usually similar to triple batteries in a torch
a fuse should melts if a significantly higher than normal current flows
The five circuits show various arrangements of identical cells and identical batteries. If the ammeter reading in circuit 02 is 0.3A, in which circuit will the ammeter reading be 0.6A? [7j-85]
circuit 03
circuit 04
circuit 07
circuit 08
The five circuits show various arrangements of identical cells and identical batteries. If the ammeter reading in circuit 02 is 0.3A, in which circuit will the ammeter reading be 0.15A? [7j-86]
circuit 03
circuit 04
circuit 07
circuit 08
The five circuits show various arrangements of identical cells and identical batteries. If the ammeter reading in circuit 02 is 0.3A, in which circuit will the ammeter reading be 0.9A? [7j-87]
circuit 03
circuit 04
circuit 07
circuit 08
The five circuits show various arrangements of identical cells and identical batteries. If the ammeter reading in circuit 02 is 0.3A, in which circuit will the ammeter reading be 0.1A? [7j-88]
circuit 03
circuit 04
circuit 07
circuit 08
In circuit 24 two cells, 2 bulbs and a switch are wired in series. An extra wire has been added to the similar circuits 25, 26 and 27. In which circuit will bulbs b1 and b2 light up when the switch s is closed is closed? [7j-89]
circuit 24
circuit 25
circuit 26
circuit 27
In circuit 24 two cells, 2 bulbs and a switch are wired in series. An extra wire has been added to the similar circuits 25, 26 and 27. In which circuit will only bulb b2 light upand only if switch s is closed? [7j-90]
circuit 24
circuit 25
circuit 26
circuit 27
In circuit 24 two cells, 2 bulbs and a switch are wired in series. An extra wire has been added to the similar circuits 25, 26 and 27. In which circuit will only bulb b2 light up but does not need switch s to be closed? [7j-91]
circuit 24
circuit 25
circuit 26
circuit 27
In circuit 24 two cells, 2 bulbs and a switch are wired in series. An extra wire has been added to the similar circuits 25, 26 and 27. In which circuit will only bulb b1 light up when the switch s is closed? [7j-92]
circuit 24
circuit 25
circuit 26
circuit 27
If bulb b1 'blows' what happens to the other bulbs? [7j-93]
b2, b3, b4, b5 and b6 all stay lit
b2 and b3 stay lit but b4, b5 and b6 also go out
b4, b5 and b6 stay lit, but b2 and b3 also go out
b2, b3, b4, b5 and b6 also go out
If bulb b2 'blows' what happens to the other bulbs? [7j-94]
b1, b3, b4, b5 and b6 stay lit
b1, b4, b5 and b6 stay lit, but b3 also goes out
b4, b5 and b6 stay lit, but b1 and b3 also go out
b1, b3, b4, b5 and b6 also go out
If bulb b5 'blows' what happens to the other bulbs? [7j-95]
b1, b2, b3, b4 and b6 stay lit
b1, b2, b3 and b6 stay lit, but b4 also goes out
b1, b2 and b3 stay lit but b4 and b6 also go out
b1, b2, b3, b4 and b6 also go out
In the circuit 20 shown above, all the bulbs light up when all the switches are closed. What happens to the other bulbs if bulb b2 'blows'? [7j-96]
b4 and b5 go out, b1, b3 and b6 stay lit
b1, b3 and b6 go out, b4 and b5 stay lit
b1, b5 and b6 stay lit, b3 and b4 go out
b1 still lit, b3, b4, b5 and b6 go out
In the circuit 20 shown above, all the bulbs light up when all the switches are closed. What happens to the other bulbs if bulb b3 'blows'? [7j-97]
b6 goes out, b1, b2, b4 and b5 stay lit
b2 and b6 go out, b1, b4 and b5 stay lit
b4 and b5 go out, b1, b2 and b6 stay lit
b2 goes out, b1, b4, b5 and b6 stay lit
In the circuit 20 shown above, all the bulbs light up when all the switches are closed. What happens to the other bulbs if bulb b4 'blows'? [7j-98]
b5 and b6 go out, b1, b2 and b3 stay lit
b5 goes out, b1, b2, b3 and b6 stay lit
b1 and b5 go out, b2, b3 and b6 stay lit
b3, b5 and b6 go out, b1 and b2 stay lit
In the circuit 20 shown above, all the bulbs light up when all the switches are closed. What happens to the other bulbs if bulb b5 'blows'? [7j-99]
b3 goes out, b1, b2, b4 and b6 stay lit
b2 and b4 go out, b1 and b6 stay lit
b4 goes out, b1, b2, b3 and b6 stay lit
b3 and b6 go out, b1, b2 and b4 stay lit
In the circuit 20 shown above, all the bulbs light up when all the switches are closed. What happens to the other bulbs if bulb b6 'blows'? [7j-100]
b4 goes out, b1, b2, b3 and b5 stay lit
b3 and b5 go out, b1, b2 and b4 stay lit
b4 and b5 go out, b1, b2 and b3 stay lit
b3 goes out, b1, b2, b4 and b5 stay lit
[7j-101] One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour (1 unit = 1 kWh). If a 2kW room heater was used for 2 hrs and 30 minutes, how many kWh units of electricity are used?
5.0 kWh
0.8 kWh
1.25 kWh
4.5 kWh
[7j-102] One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour (1 unit = 1 kWh). How many kWh of electrical energy is used if a 800W central heating pump is on for 12 hours?
66.6 kWh
9.6 kWh
0.015 kWh
1.5 kWh
[7j-103] One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour (1 unit = 1 kWh). How many kWh of electrical energy is used if a 3 kW oven is used for 1 hour and 45 minutes?
2.0 kWh
0.58 kWh
5.25 kWh
1.71 kWh
[7j-104] One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour (1 unit = 1 kWh). How many kWh of electrical energy is used if 200 W set of LED Christmas lights are on for 15 hours?
13.3 kWh
0.075 kWh
3000 kWh
3.0 kWh
[7j-105] How much electrical energy is transferred to water when a 2 kW kettle takes 40 seconds to boil?
80 kJ
8000 J
50 J
5 kJ
[7j-106] How much electrical energy is transferred when a 30 W torch is used for 5 minutes?
6 J
9000 J
0.9 kJ
150 J
[7j-107] How much electrical energy is transferred when a 60 W laptop computer is used for 45 minutes?
1.75 kJ
2.7 kJ
162 kJ
0.75 kJ
[7j-108] How much electrical energy is transferred when four 20 W light bulbs are on for 30 minutes?
600 J
6 kJ
14 400 J
144 kJ
[7j-109] Read A-D carefully! Which of the following statement about electricity is NOT completely true?
An electrical conductor is a material that allows current to flow through it relatively easily and has a high resistance.
An electrical insulator is a material that does not readily allow current to flow through it and has a high resistance.
An electric resistor inhibits current (charge) flow and causes the transfer of useful/waste energy to the surroundings.
An electrical current is the movement of charge (eg negative electrons) through a conducting material.
Electrical power is the rate (speed) at which energy is transferred by some device.
[7j-110] Read A-D carefully! Which of the following statement about electricity is NOT completely true?
An electrical conductor is a material that allows current to flow through it relatively easily and has a low resistance.
An electrical insulator is a material that does not readily allow current to flow through it and has a low resistance.
An electric resistor inhibits current (charge) flow and causes the transfer of useful/waste energy to the surroundings.
An electrical current is the movement of charge (eg negative electrons) through a conducting material.
Electrical power is the rate (speed) at which energy is transferred by some device.
[7j-111] Read A-D carefully! Which of the following statement about electricity is NOT completely true?
An electrical conductor is a material that allows current to flow through it relatively easily and has a low resistance.
An electrical insulator is a material that does not readily allow current to flow through it and has a high resistance.
An electric resistor inhibits current (charge) flow and always causes the transfer of useful energy to the surroundings.
An electrical current is the movement of charge (eg negative electrons) through a conducting material.
Electrical power is the rate (speed) at which energy is transferred by some device.
[7j-112] Read A-D carefully! Which of the following statement about electricity is NOT completely true?
An electrical conductor is a material that allows current to flow through it relatively easily and has a low resistance.
An electrical insulator is a material that does not readily allow current to flow through it and has a high resistance.
An electric resistor inhibits current (charge) flow and causes the transfer of useful/waste energy to the surroundings.
An electrical current is the movement of positive ions through a metal conductor.
Electrical power is the rate (speed) at which energy is transferred by some device.
[7j-113] Read A-D carefully! Which of the following statement about electricity is NOT completely true?
An electrical conductor is a material that allows current to flow through it relatively easily and has a low resistance.
An electrical insulator is a material that does not readily allow current to flow through it and has a high resistance.
An electric resistor inhibits current (charge) flow and causes the transfer of useful/waste energy to the surroundings.
An electrical current is the movement of charge (eg negative electrons) through a conducting material.
Electrical power of an appliance is the rate at which useful energy is transferred by some device.
[7j-114] Which is the unit symbol for electrical resistance?
Ω
V
A
J
W
[7j-115] Which is the unit symbol for potential difference?
Ω
V
A
J
W
[7j-116] Which is the unit symbol for electrical current?
Ω
V
A
J
W
[7j-117] Which is the unit symbol for energy transferred?
Ω
V
A
J
W
[7j-118] Which is the unit symbol for the power of a device?
Ω
V
A
J
W
[7j-119] Which of the following is NOT true about electricity?
Electrical charge flows from the positive terminal of a battery to the negative terminal of a battery.
The convention current flows from the positive terminal of a battery to the negative terminal of a battery.
In a metal wire it is electrons that carry the negative electrical charge and energy.
The battery is the driving force in a circuit and its voltage (p.d.) is a measure of the energy per unit charge transferred by the current.
[7j-119] Which of the following is NOT true about electricity?
Electrical charge flows from the negative terminal of a battery to the positive terminal of a battery.
The convention current flows from the negative terminal of a battery to the positive terminal of a battery.
In a metal wire it is electrons that carry the negative electrical charge and energy.
The battery is the driving force in a circuit and its voltage (p.d.) is a measure of the energy per unit charge transferred by the current.
[7j-121] Which of the following is NOT true about electricity?
Electrical charge flows from the negative terminal of a battery to the positive terminal of a battery.
The convention current flows from the positive terminal of a battery to the negative terminal of a battery.
In a metal wire it is positive ions that carry the negative electrical charge and energy.
The battery is the driving force in a circuit and its voltage (p.d.) is a measure of the energy per unit charge transferred by the current.
[7j-122] Which of the following is NOT completely true about electricity?
Electrical charge flows from the negative terminal of a battery to the positive terminal of a battery.
The convention current flows from the positive terminal of a battery to the negative terminal of a battery.
In a metal wire it is electrons that carry the negative electrical charge and energy.
The resistors are the driving force in a circuit and the voltage (p.d.) across them is a measure of the energy per unit charge transferred by the current.
[7j-123] Which is NOT true concerning static electricity?
Static electricity is only created when an object loses electrons.
If an object gains electrons it becomes negatively charged.
If an object loses electrons it becomes positively charged.
If an object with a negative charge is brought near an object with a positive charge, they attract each other.
[7j-124] Which is NOT true concerning static electricity?
Static electricity is created when an object loses or gains electrons.
If an object gains electrons it becomes positively charged.
Objects with unlike static charges, attract each other.
If an object with a negative charge is brought near an object with a positive charge, they attract each other.
[7j-125] Which is NOT true concerning static electricity?
Static electricity is created when an object loses or gains electrons.
Objects with unlike static charges, attract each other.
If an object loses electrons it becomes negatively charged.
If an object with a negative charge is brought near an object with a positive charge, they attract each other.
[7j-126] Which is NOT true concerning static electricity?
Static electricity is created when an object loses or gains electrons.
If an object gains electrons it becomes negatively charged.
If an object loses electrons it becomes positively charged.
If an object with a negative charge is brought near an object with a positive charge, they repel each other.
[7j-127] If the p.d. across a resistor is 15.0 V, what is its resistance if the current flowing through it is 3.0 A?
5.0 Ω
45.0 Ω
0.2 Ω
18.0 Ω
[7j-128] If the p.d. across a resistor is 220 V, what is its resistance if the current flowing through it is 5.0 A?
44 Ω
1100 Ω
0.023 Ω
225 Ω
[7j-129] If the p.d. across a bulb filament is 4.5 V, what is the bulb's resistance if the current flowing through it is 0.5 A?
9.0 Ω
2.25 Ω
0.11 Ω
5.0 Ω
[7j-130] If the p.d. across a resistor is 240 V, what is its resistance if the current flowing through it is 8.0 A?
30 Ω
1920 Ω
0.033 Ω
248 Ω
[7j-131] What is the p.d. across a resistor of 11 Ω if the current flowing through it is 20 A?
0.55 V
220 V
1.82 V
31 V
[7j-132] What is the p.d. across a resistor of 3.0 Ω if the current flowing through it is 1.5 A?
1.5 V
4.5 V
0.17 V
3.5 V
[7j-133] What is the p.d. across a resistor of 30 Ω if the current flowing through it is 8.0 A?
3.75 V
240 V
0.27 V
38 V
[7j-134] What is the p.d. across a resistor of 4.0 Ω if the current flowing through it is 3.0 A?
0.75 V
12.0 V
1.33 V
7.0 V
[7j-135] What is the current flowing through a resistor of 7.5 Ω if the p.d. across it is 1.5 V?
11.25 A
5.0 A
0.20 A
10.0 A
[7j-136] What is the current flowing through a resistor of 55 Ω if the p.d. across it is 220 V?
11.25 A
5.0 A
4.0 A
10.0 A
[7j-137] What is the current flowing through a resistor of 8.0 Ω if the p.d. across it is 12.0 V?
0.67 A
0.66 A
1.5 A
20.0 A
[7j-138] What is the current flowing through a resistor of 50 Ω if the p.d. across it is 240 V?
0.21 A
1.2 A
4.8 A
290 A
[7j-139] What is the power of a device if the current flowing through it is 0.2 A and the p.d. across it is 1.5 V?
0.13 W
7.5 W
1.70 W
0.30 W
[7j-140] What is the power of a device if the current flowing through it is 8.0 A and the p.d. across it is 250 V?
31 W
0.032 kW
3100 W
2.0 kW
[7j-141] What is the power of a device if the current flowing through it is 3.6 A and the p.d. across it is 220 V?
0.016 kW
61 W
1.58 kW
792 W
[7j-142] What is the power of a device if the current flowing through it is 12.0 A and the p.d. across it is 250 V?
0.048 kW
20.8 W
2080 W
3.0 kW
[7j-143] What is the current flowing through a device operating with a p.d. of 240 V and a power rating of 1200 W?
0.2 A
3.6 A
288 A
5.0 A
[7j-144] What is the current flowing through a device operating with a p.d. of 240 V and a power rating of 60 W?
4.0 A
2.5 A
40 A
0.25 A
[7j-145] What is the current flowing through a device operating with a p.d. of 220 V and a power rating of 700 W?
2.92 A
1.54 A
30.3 A
3.18 A
[7j-146] What is the current flowing through a device operating with a p.d. of 240 V and a power rating of 2.5 kW?
96 A
60 A
60 A
10.4 A
[7j-147] What is the p.d. across a device operating with a current of 0.20 A and a power rating of 0.90 W?
1.8 V
0.22 V
4.5 V
0.45 V
[7j-148] What is the p.d. across a device operating with a current of 8.0 A and a power rating of 1.92 kW?
15.4 V
4.16 V
240 V
150 V
[7j-149] What is the p.d. across a device operating with a current of 5.0 A and a power rating of 60 W?
65 V
0.083 V
12 V
30 V
[7j-150] What is the p.d. across a device operating with a current of 5.0 A and a power rating of 1.1 kW?
5.50 V
4.54 V
220 V
30.0 V
[7j-151] Which is NOT completely true about magnetism?
When a current flows through a wire, there may be magnetic field is created around it.
The field lines of magnetic flux are considered to flow from the north pole to the south pole of a magnet.
An electric motor works by the interaction of two separate, but adjacent, magnetic fields.
A solenoid consists of many coils of wire arranged to create a more concentrated stronger magnetic field.
[7j-152] Which is NOT true about magnetism?
When a current flows through a wire, a magnetic field is created around it.
The field lines of magnetic flux are considered to flow from the south pole to the north pole of a magnet.
An electric motor works by the interaction of two separate, but adjacent, magnetic fields.
A solenoid consists of many coils of wire arranged to create a more concentrated stronger magnetic field.
[7j-153] Which is NOT true about magnetism?
When a current flows through a wire, a magnetic field is created around it.
The field lines of magnetic flux are considered to flow from the north pole to the south pole of a magnet.
An electric motor works by the interaction of an electric field and a magnetic field.
A solenoid consists of many coils of wire arranged to create a more concentrated stronger magnetic field.
[7j-154] Which is NOT completely true about magnetism?
When a current flows through a wire, a magnetic field is created around it.
The field lines of magnetic flux are considered to flow from the north pole to the south pole of a magnet.
An electric motor works by the interaction of two separate, but adjacent, magnetic fields.
A solenoid consists of parallel strands of wire arranged to create a magnetic field.
[7j-155] Which of the following does not increase the strength of the magnetic field when an electric current flows through a solenoid?
decreasing the current
increase the number of coils
placing an iron rod inside the coil
packing the coils closer together
[7j-156] Which of the following does not increase the strength of the magnetic field when an electric current flows through a solenoid?
increasing the current
decrease the number of coils
placing an iron rod inside the coil
packing the coils closer together
[7j-157] Which of the following does not increase the strength of the magnetic field when an electric current flows through a solenoid?
increasing the current
increase the number of coils
placing an copper rod inside the coil
packing the coils closer together
[7j-158] Which of the following does not increase the strength of the magnetic field when an electric current flows through a solenoid?
increasing the current
increase the number of coils
placing an iron rod inside the coil
packing the coils further apart.
[7j-159] The compass needle points 'north' when no current flows through the solenoid coil containing a iron rod. When the current is switched on, in which direction will the compass needle point?
[7j-160] The compass needle points 'north' when no current flows through the solenoid coil containing a iron rod. When the current is switched on, in which direction will the compass needle point?
[7j-161] The diagram shows the direction the compass needle points when the current is flowing through the solenoid coil. If the terminals of the battery are swapped around, in which direction will the compass needle point?
[7j-162] The diagram shows the direction the compass needle points when the current is flowing through the solenoid coil. If the terminals of the battery are swapped around, in which direction will the compass needle point?
[7j-163] Which is NOT completely true about the Earth's magnetic field?
The geographic north pole of the Earth is the north pole of the Earth's magnetic field.
The Earth's magnetic field is caused by the core, composed mainly of an iron and nickel mixture.
The magnetic north pole of a compass needle points to the magnetic south pole of the Earth's magnetic field.
A compass needle aligns itself along the field lines of the Earth's magnetic field from north to south.
[7j-164] Which is NOT completely true about the Earth's magnetic field?
The geographic north pole of the Earth is the south pole of the Earth's magnetic field.
The Earth's magnetic field is caused by the core, composed mainly of an iron and copper mixture.
The magnetic north pole of a compass needle points to the magnetic south pole of the Earth's magnetic field.
A compass needle aligns itself along the field lines of the Earth's magnetic field from north to south.
[7j-165] Which is NOT completely true about the Earth's magnetic field?
The geographic north pole of the Earth is the south pole of the Earth's magnetic field.
The Earth's magnetic field is caused by the core, composed mainly of an iron and nickel mixture.
The magnetic south pole of a compass needle points to the magnetic south pole of the Earth's magnetic field.
A compass needle aligns itself along the field lines of the Earth's magnetic field from north to south.
[7j-166] Which is NOT completely true about the Earth's magnetic field?
The geographic north pole of the Earth is the south pole of the Earth's magnetic field.
The Earth's magnetic field is caused by the core, composed mainly of an iron and nickel mixture.
The magnetic north pole of a compass needle points to the magnetic south pole of the Earth's magnetic field.
A compass needle aligns itself along the field lines of the Earth's magnetic field from south to north.
[7j-167] How much energy is transferred if a 50 W powered radio is used for 5 minutes?
10 J
25 kJ
250 J
15 kJ
[7j-168] How much energy is transferred if a 500 W powered kettle is used for 2 minutes?
6000 J
250 J
3000 J
60 kJ
[7j-169] Which is NOT correct concerning circuit 49?
The bulb and ammeter A1 are wired in parallel.
The bulb and resistor are wired in parallel.
The resistor and ammeter A2 are wired in series.
The p.d. (V) is the same across both the bulb (V1) and the resistor (V2).
[7j-170] Which is NOT correct concerning circuit 49?
The bulb and ammeter A1 are wired in series.
The bulb and resistor are wired in series.
The resistor and ammeter A2 are wired in series.
The p.d. (V) is the same across both the bulb (V1) and the resistor (V2).
[7j-171] Which is NOT correct concerning circuit 49?
The bulb and ammeter A1 are wired in series.
The bulb and resistor are wired in parallel.
The resistor and ammeter A2 are wired in parallel.
The p.d. (V) is the same across both the bulb (V1) and the resistor (V2).
[7j-172] Which is NOT correct concerning circuit 49?
The bulb and ammeter A1 are wired in series.
The bulb and resistor are wired in parallel.
The resistor and ammeter A2 are wired in series.
The potential differences across both the bulb (V1) and the resistor (V2) are different.
[7j-173] Which is NOT correct concerning circuit 50?
The bulb b2 and ammeter A2 are wired in parallel.
The two bulbs are wired in parallel.
The bulb b2 and voltmeter V2 are wired in parallel.
The p.d. (V) across both bulbs is the same.
[7j-174] Which is NOT correct concerning circuit 50?
The bulb b2 and ammeter A2 are wired in series.
The two bulbs are wired in series.
The bulb b2 and voltmeter V2 are wired in parallel.
The p.d. (V) across both bulbs is the same.
[7j-175] Which is NOT correct concerning circuit 50?
The bulb b2 and ammeter A2 are wired in series.
The two bulbs are wired in parallel.
The bulb b2 and voltmeter V2 are wired in series.
The p.d. (V) across both bulbs is the same.
[7j-176] Which is NOT correct concerning circuit 50?
The bulb b2 and ammeter A2 are wired in series.
The two bulbs are wired in parallel.
The bulb b2 and voltmeter V2 are wired in parallel.
The p.d. (V) across the two bulbs is not the same.
[7j-177] In circuit 49, if ammeter A1 reads 0.85 A and ammeter A3 reads 1.50 A, what will ammeter A2 read?
0.65 A
0.75 A
2.35 A
0.85 A
[7j-178] In circuit 49, if ammeter A2 reads 0.75 A and ammeter A4 reads 2.85 A, what will ammeter A1 read?
2.10 A
0.75 A
3.60 A
1.10 A
[7j-179] In circuit 49, if ammeter A1 reads 1.75 A and ammeter A2 reads 2.45 A, what will ammeter A3 read?
4.20 A
0.70 A
1.30 A
1.10 A
[7j-180] In circuit 49, if ammeter A1 reads 2.80 A and ammeter A2 reads 1.45 A, what will ammeter A4 read?
4.25 A
2.13 A
1.35 A
2.90 A
[7j-181] In circuit 50, if ammeter A1 reads 0.66 A, what will ammeter A2 most likely read?
0.33 A
1.95 A
1.98 A
0.66 A
[7j-182] In circuit 50, if ammeter A2 reads 1.46 A, what will ammeter A3 most likely read?
0.73 A
7.30 A
1.46 A
2.92 A
[7j-183] In circuit 51, assuming the bulbs are identical, if voltmeter V1 reads 1.5 V, what will voltmeter V3 read?
4.5 V
3.0 V
1.5 V
0.5 V
[7j-184] In circuit 51, assuming the bulbs are identical, if voltmeter V2 reads 1.5 V, what will voltmeter V3 read?
4.5 V
3.0 V
1.5 V
0.5 V
[7j-185] In circuit 51, assuming the bulbs are identical, if voltmeter V2 reads 1.5 V, what will voltmeter V4 read?
1.5 V
3.0 V
4.5 V
0.5 V
[7j-186] In circuit 51, assuming the bulbs are identical, if ammeter A2 reads 1.5 A, what will ammeter A1 read?
0.5 A
4.5 A
1.5 A
3.0 A
[7j-187] In circuit 51, assuming the bulbs are identical, if ammeter A1 reads 1.5 A, what will ammeter A3 read?
0.5 A
4.5 A
1.5 A
3.0 A
[7j-188] In circuit 51, assuming the bulbs are identical, if ammeter A2 reads 1.5 A, what will ammeter A3 read?
0.5 A
4.5 A
1.5 A
3.0 A
[7j-189] The diagram shows how a relay switch can be used to control a device in another electrical circuit. Which of the following statements about how the system works is incorrect?
When the switch (1) is closed the solenoid coil (2) creates a permanent magnetic field.
The input (primary circuit) can be operated with a low voltage-current to switch on the a device (5) which can be a high voltage-current powerful electric motor.
The solenoid coil (2) and soft iron core act as a temporary magnet.
The solenoid coil (2) attracts the pivoted L piece (3) which closes the switch contacts (4) to operate the electric motor (5).
[7j-190] The diagram shows how a relay switch can be used to control a device in another electrical circuit. Which of the following statements about how the system works is incorrect?
When the switch (1) is closed the solenoid coil (2) creates a temporary magnetic field.
The input (primary circuit) must be operated with a high voltage-current value to switch on a powerful device (5) like a powerful electric motor.
The solenoid coil (2) and soft iron core act as a temporary magnet.
The solenoid coil (2) attracts the pivoted L piece (3) which closes the switch contacts (4) to operate the electric motor (5).
[7j-191] The diagram shows how a relay switch can be used to control a device in another electrical circuit. Which of the following statements about how the system works is incorrect?
When the switch (1) is closed the solenoid coil (2) creates a temporary magnetic field.
The input (primary circuit) can be operated with a low voltage-current to switch on the a device (5) which can be a high voltage-current powerful electric motor.
The solenoid coil (2) and soft iron core act as a permanent magnet.
The solenoid coil (2) attracts the pivoted L piece (3) which closes the switch contacts (4) to operate the electric motor (5).
[7j-192] The diagram shows how a relay switch can be used to control a device in another electrical circuit. Which of the following statements about how the system works is incorrect?
When the switch (1) is closed the solenoid coil (2) creates a temporary magnetic field.
The input (primary circuit) can be operated with a low voltage-current to switch on the a device (5) which can be a high voltage-current powerful electric motor.
The solenoid coil (2) and soft iron core act as a temporary magnet.
The solenoid coil (2) repels the pivoted L piece (3) to close the switch contacts (4) to operate the electric motor (5).
[7j-193] The diagram illustrates the circuit of an electric bell system. Which of the following statements about how the bell works is incorrect?
When the bell push switch is closed the two solenoid coils create a permanent magnetic field.
The striker-armature is attracted to hit the bell by the magnetic field of the solenoid coils.
When the striker hits the bell, the circuit is broken removing the magnetic field and the striker springs back to its original position.
The core of the solenoid coils and the armature must be made of soft iron so they can only act as a temporary magnet.
[7j-194] The diagram illustrates the circuit of an electric bell system. Which of the following statements about how the bell works is incorrect?
When the bell push switch is closed the two solenoid coils create a temporary magnetic field.
The striker-armature is attracted to hit the bell by the electric field of the solenoid coils.
When the striker hits the bell, the circuit is broken removing the magnetic field and the striker springs back to its original position.
The core of the solenoid coils and the armature must be made of soft iron so they can only act as a temporary magnet.
[7j-195] The diagram illustrates the circuit of an electric bell system. Which of the following statements about how the bell works is incorrect?
When the bell push switch is closed the two solenoid coils create a temporary magnetic field.
The striker-armature is attracted to hit the bell by the magnetic field of the solenoid coils.
When the striker hits the bell, the circuit is completed creating the magnetic field and the striker springs back to its original position.
The core of the solenoid coils and the armature must be made of soft iron so they can only act as a temporary magnet.
[7j-196] The diagram illustrates the circuit of an electric bell system. Which of the following statements about how the bell works is incorrect?
When the bell push switch is closed the two solenoid coils create a temporary magnetic field.
The striker-armature is attracted to hit the bell by the magnetic field of the solenoid coils.
When the striker hits the bell, the circuit is broken removing the magnetic field and the striker springs back to its original position.
The core of the solenoid coils and the armature must be made of soft iron so they can only act as a permanent magnet.
[7j-197] The diagram illustrates how a loudspeaker works. Which of the following statements about how a loudspeaker works is incorrect?
The loudspeaker works on the interaction between a permanent magnetic field (solenoid coil) and a temporary magnetic field (E shaped magnet).
The solenoid coil attached to the cone creates a temporary and varying magnetic field when the current flows through it.
The variation of the solenoid magnetic field produces the changes in frequencies and amplitudes of the cone vibrations, hence the sound reproduction.
The variation of the frequencies and amplitudes of the electrical current signal cause complex variations in the magnetic field of the solenoid coil.
[7j-198] The diagram illustrates how a loudspeaker works. Which of the following statements about how a loudspeaker works is incorrect?
The loudspeaker works on the interaction between a temporary magnetic field (solenoid coil) and a permanent magnetic field (E shaped magnet).
The solenoid coil attached to the cone creates a permanent and constant magnetic field when the current flows through it.
The variation of the solenoid magnetic field produces the changes in frequencies and amplitudes of the cone vibrations, hence the sound reproduction.
The variation of the frequencies and amplitudes of the electrical current signal cause complex variations in the magnetic field of the solenoid coil.
[7j-199] The diagram illustrates how a loudspeaker works. Which of the following statements about how a loudspeaker works is incorrect?
The loudspeaker works on the interaction between a temporary magnetic field (solenoid coil) and a permanent magnetic field (E shaped magnet).
The solenoid coil attached to the cone creates a temporary and varying magnetic field when the current flows through it.
The variation of the magnetic field of the permanent magnet E creates the changes in frequencies and amplitudes of the cone vibrations, hence the sound reproduction.
The variation of the frequencies and amplitudes of the electrical current signal cause complex variations in the magnetic field of the solenoid coil.
[7j-200] The diagram illustrates how a loudspeaker works. Which of the following statements about how a loudspeaker works is incorrect?
The loudspeaker works on the interaction between a temporary magnetic field (solenoid coil) and a permanent magnetic field (E shaped magnet).
The solenoid coil attached to the cone creates a temporary and varying magnetic field when the current flows through it.
The variation of the solenoid magnetic field produces the changes in frequencies and amplitudes of the cone vibrations, hence the sound reproduction.
The variation of the frequencies and amplitudes of the electrical current signal cause complex variations in the permanent magnetic field of the solenoid coil.
[7j-201] Which of the following statements is incorrect about static electricity?
Rubbing non-conducting materials together, like a plastic rod rubbed with a dry cloth, creates a negative and a positive electric field throughout the materials.
Electrons are tiny particles that carry a negative electric charge.
Weakly conducting materials are added to polymer materials to prevent rapid unwanted discharge of static electricity e.g. sparks.
When two electrically statically charged objects are brought together they attract or repel each other.
[7j-202] Which of the following statements is incorrect about static electricity?
Rubbing non-conducting materials together, like a plastic rod rubbed with a dry cloth, creates a negative and a positive electric field on the surface of the materials.
Electrons are tiny particles that carry a positive electric charge.
Weakly conducting materials are added to polymer materials to prevent rapid unwanted discharge of static electricity e.g. sparks.
When two electrically statically charged objects are brought together they attract or repel each other.
[7j-203] Which of the following statements is incorrect about static electricity?
Rubbing non-conducting materials together, like a plastic rod rubbed with a dry cloth, creates a negative and a positive electric field on the surface of the materials.
Electrons are tiny particles that carry a negative electric charge.
Weakly conducting materials are added to polymer materials to store unwanted static electricity.
When two electrically statically charged objects are brought together they attract or repel each other.
[7j-204] Which of the following statements is incorrect about static electricity?
Rubbing non-conducting materials together, like a plastic rod rubbed with a dry cloth, creates a negative and a positive electric field on the surface of the materials.
Electrons are tiny particles that carry a negative electric charge.
Weakly conducting materials are added to polymer materials to prevent rapid unwanted discharge of static electricity e.g. sparks.
When two electrically statically charged objects are brought together they always attract each other.
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 1? [7i-53]
burn fuel
heat water
move turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 2? [7i-54]
burn fuel
heat water
move turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 3? [7i-55]
burn fuel
heat water
move turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 4? [7i-56]
burn fuel
heat water
move turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 1? [7i-57]
solar radiation
air movement
rotating turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 2? [7i-58]
solar radiation
air movement
rotating turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 3? [7i-59]
solar radiation
air movement
rotating turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 4? [7i-60]
solar radiation
air movement
rotating turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 1? [7i-61]
rain water and dam
flowing water
rotating turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 2? [7i-62]
rain water and dam
flowing water
rotating turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 3? [7i-63]
rain water and dam
flowing water
rotating turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 4? [7i-64]
rain water and dam
flowing water
rotating turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 1? [7i-65]
hot volcanic rocks
making steam flow fast
rotating turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 2? [7i-66]
hot volcanic rocks
making steam flow fast
rotating turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 3? [7i-67]
hot volcanic rocks
making steam flow fast
rotating turbine
turn generator
The diagram summarises four stages for a way of producing electricity. Which of the following matches stage 4? [7i-68]
hot volcanic rocks
making steam flow fast
rotating turbine
turn generator
Which description matches a solar cell? [7i-69]
electrical energy directly from sunlight
water stored behind a dam
air flow driven by the sun
mainly due to the movement of the moon
Which description matches hydroelectric power? [7i-70]
electrical energy directly from sunlight
water stored behind a dam
air flow driven by the sun
mainly due to the movement of the moon
[7i-118] A polythene rod is rubbed with a cloth. What sort of energy store is created?
electrostatic energy store
magnetic energy store
kinetic energy store
chemical energy store
[7i-119] An night storage heater is uses cheaper off-peak electricity. What sort of energy store is created?
electrostatic energy store
thermal energy store
electrical energy store
chemical energy store
[7i-120] A mobile phone battery is charged up. What sort of energy store is created?
electrostatic energy store
thermal energy store
electrical energy store
chemical energy store
Which form of energy is carried by a current of moving charge? [9i-16]
nuclear
elastic/strain potential
kinetic
electrical
One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour. [9i-19] What is the cost of using a 1.5kW heater for 2 hours if the cost of electricity is 7p/unit?
10.5p
3.5p
21.0p
7.0p
One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour. [9i-20] What is the cost of using a 3 kW heater for 6 hours if the cost of electricity is 6p/unit?
54p
£2.16
36p
£1.08
One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour. [9i-21] What is the cost of using a 60W light bulb for 20 hours if the cost of electricity is 5p/unit?
6p
£6.00
£1.20
60p
One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour. [9i-22] What is the cost of using a 700W iron for 2.5 hours if the cost of electricity is 8p/unit?
7.0p
14p
160p
3p
One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour. [9i-23] What is the cost of using a 200W hair dryer for 10 minutes if the cost of electricity is 6p/unit?
2p
1.2p
0.2p
12p
One unit of electricity is equal to using a 1000W (a power of 1kW) appliance for 1 hour. [9i-24] What is the cost of using a 4kW oven for 5 hours if the cost of electricity is 7p/unit?
£0.70
20p
35p
£1.40
What is the overall energy change using a loudspeaker? [9i-25]
electrical to sound
sound to electrical
chemical to kinetic
light to electrical
What is the overall energy change using a microphone? [9i-26]
electrical to sound
sound to electrical
chemical to kinetic
light to electrical
What is the overall energy change using a solar cell? [9i-28]
electrical to sound
sound to electrical
chemical to kinetic
light to electrical
What are the energy changes for using a diesel generator to operate an electrical appliance? [9i-30]
In the home electrical energy is converted into useful forms by various appliances. Four examples (1)-(4) are listed below, including what happens to a % of the original electrical energy. Which statement of A-D is most likely NOT true? Examples: (1) A lamp coverts 5% of the energy into light. (2) A kettle uses 97% of the energy to heat the water. (3) A typical food mixer wastes 60% of the energy input. (4) A HiFi system converts 30% of the energy into sound and light. [9i-52]
95% of the electrical energy is wasted as heat by the lamp by conduction and radiation
the electric kettle is the most energy efficient appliance with least wasted energy
the food mixer converts 40% of the electrical energy into useful kinetic energy
The HiFi wastes 50% of the electrical energy, mainly as heat or thermal energy
In the home electrical energy is converted into useful forms by various appliances. Four examples (1)-(4) are listed below, including what happens to a % of the original electrical energy. Which statement of A-D is most likely NOT true? Examples: (1) A lamp coverts 5% of the energy into light. (2) A kettle uses 97% of the energy to heat the water. (3) A typical food mixer wastes 60% of the energy input. (4) A HiFi system converts 30% of the energy into sound and light. [9i-53]
the lamp is the most efficient appliance with the least wasted energy
3% of the electrical energy is wasted by the kettle, mainly by conduction and convection losses
the food mixer converts about 60% of the electrical energy into heat and sound energy
The HiFi produces sound energy that is not wasted
In the home electrical energy is converted into useful forms by various appliances. Four examples (1)-(4) are listed below, including what happens to a % of the original electrical energy. Which statement of A-D is most likely NOT true? Examples: (1) A lamp coverts 5% of the energy into light. (2) A kettle uses 97% of the energy to heat the water. (3) A typical food mixer wastes 60% of the energy input. (4) A HiFi system converts 30% of the energy into sound and light. [9i-54]
the lamp is the least efficient appliance with the most wasted energy
3% of the electrical energy is wasted by the kettle, mainly by leaked conduction of electrical charge or current
the food mixer converts about 60% of the electrical energy into heat and sound energy
The HiFi produces sound energy that is not wasted
In the home electrical energy is converted into useful forms by various appliances. Four examples (1)-(4) are listed below, including what happens to a % of the original electrical energy. Which statement of A-D is most likely NOT true? Examples: (1) A lamp coverts 5% of the energy into light. (2) A kettle uses 97% of the energy to heat the water. (3) A typical food mixer wastes 60% of the energy input. (4) A HiFi system converts 30% of the energy into sound and light. [9i-55]
the lamp is the least efficient appliance with the most wasted energy
3% of the electrical energy is wasted by the kettle, mainly by conduction and convection losses
the food mixer converts about 40% of the electrical energy into useful heat and sound energy
The HiFi produces sound energy that is not wasted
In the home electrical energy is converted into useful forms by various appliances. Four examples (1)-(4) are listed below, including what happens to a % of the original electrical energy. Which statement of A-D is most likely NOT true? Examples: (1) A lamp coverts 5% of the energy into light. (2) A kettle uses 97% of the energy to heat the water. (3) A typical food mixer wastes 60% of the energy input. (4) A HiFi system converts 30% of the energy into sound and light. [9i-56]
the lamp is the least efficient appliance with the most wasted energy
3% of the electrical energy is wasted by the kettle, mainly by conduction and convection losses
the food mixer converts about 60% of the electrical energy into heat and sound energy
The HiFi produces sound energy that is wasted
Mobile phones operate on a charged up battery system. Which energy transfer corresponds to listening to recorded message? [9i-57]
chemical => electrical => sound
electrical => chemical
chemical => electrical => light
light => electrical => sound
Mobile phones operate on a charged up battery system. Which energy transfer corresponds to charging the battery? [9i-58]
chemical => electrical => sound
electrical => chemical
chemical => electrical => light
light => electrical
Mobile phones operate on a charged up battery system. Which energy transfer corresponds to receiving a text message? [9i-59]
chemical => electrical => sound
electrical => chemical => light
chemical => electrical => light
light => electrical
Mobile phones operate on a charged up battery system. Which energy transfer corresponds to recording pictures to transmit? [9i-60]
chemical => electrical => sound
electrical => chemical
chemical => electrical => light
light => electrical
Various sorts of energy resources can be used to produce electricity for use in the home. Which type of energy resource produces electrical energy from a torch battery? [9i-69]
chemical energy
sunlight energy
kinetic energy
heat energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity in a calculator solar cell? [9i-70]
chemical energy
sunlight energy
kinetic energy
heat energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity using a wind turbine? [9i-71]
chemical energy
geothermal energy
kinetic energy
gravitational potential energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity in a geothermal power station? [9i-72]
chemical energy
sunlight energy
gravitational potential energy
heat energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity from a diesel/petrol generator? [9i-73]
chemical energy
sunlight energy
kinetic energy
gravitational potential energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity from a mountain stream turbine generator? [9i-74]
chemical energy
gravitational potential energy
solar radiation energy
heat energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity from a river paddle wheel generator? [9i-75]
chemical energy
solar radiation energy
kinetic energy
heat energy
Various sorts of energy resources can be used to produce electricity for use in the home. Which of the following types of energy resource is used to make electricity inside a clockwork radio? [9i-76]
chemical energy
gravitational potential energy
heat energy
elastic potential energy
Various sorts of energy transfers occur when generating and using electricity. Which of the following energy transfers happens in a hydroelectric power station? [9i-77]
gravitational potential => kinetic => electrical energy
chemical => heat => kinetic => electrical energy
heat => kinetic => electrical energy
elastic potential => kinetic => electrical energy
Various sorts of energy transfers occur when generating and using electricity. Which of the following energy transfers happens in a fossil fuel power station? [9i-78]
gravitational potential => kinetic => electrical energy
chemical => heat => kinetic => electrical energy
heat => kinetic => electrical energy
elastic potential => kinetic => electrical energy
Various sorts of energy transfers occur when generating and using electricity. Which of the following energy transfers happens in a geothermal power station? [9i-79]
gravitational potential => kinetic => electrical energy
chemical => heat => kinetic => electrical energy
heat => kinetic => electrical energy
elastic potential => kinetic => electrical energy
Various sorts of energy transfers occur when generating and using electricity. Which of the following energy transfers happens in a clockwork radio? [9i-80]
gravitational potential => kinetic => electrical energy
chemical => heat => kinetic => electrical energy
heat => kinetic => electrical energy
elastic potential => kinetic => electrical energy
electrical
energy =>
useful/wasted energy outputs
energy input
transfers as a
3 J/s of wasted sound energy
of 600 J/s to
hair dryer
590 J/s of useful heat energy
the appliance
is being used
? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 600 W). Which is the most likely missing quantity and form of output energy when the hair dryer is in use? [9i-81]
7 J/s of useful kinetic energy
7 J/s of wasted potential energy
5 J/s of wasted kinetic energy
5 J/s of useful potential energy
electrical
energy =>
useful/wasted energy outputs
energy input
transfers as a
5 J/s of useful kinetic energy
of 400 J/s to
hair dryer
393 J/s of useful heat energy
the appliance
is being used
? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 400 W). Which is the most likely missing quantity and form of output energy when the hair dryer is in use? [9i-82]
2 J/s of useful kinetic energy
2 J/s of wasted sound energy
1 J/s of wasted kinetic energy
1 J/s of useful potential energy
electrical
energy =>
useful/wasted energy outputs
input energy
transfers as a
4 J/s of useful kinetic energy
of 300 J/s to
hair dryer
1 J/s of wasted sound energy
the appliance
is being used
? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 300 W). Which is the most likely missing quantity and form of output energy when the hair dryer is in use? [9i-83]
290 J/s of wasted kinetic energy
295 J/s of wasted heat energy
200 of J/s of useful heat energy and 95 J/s of wasted heat energy
200 J/s of useful potential energy and 95 J/s of wasted heat energy
electrical
energy =>
useful/wasted energy outputs
input energy
transfers as a
50 J/s of wasted sound energy
of 1000 J/s to
food mixer
400 J/s of useful kinetic energy
the appliance
is being used
? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 1 kW). Which is the most likely missing quantity and form of output energy when the food mixer is in use? [9i-84]
550 J/s of wasted kinetic energy
300 J/s of useful heat and 250 J/s of wasted kinetic energy
300 J/s of useful heat and 350 J/s of wasted potential energy
550 J/s of wasted heat energy
electrical
energy =>
useful/wasted energy outputs
input energy
transfers as a
80 J/s of wasted sound energy
of 1200 J/s to
food mixer
620 J/s of wasted heat energy
the appliance
is being used
? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 1.2 kW). Which is the most likely missing quantity and form of output energy when the food mixer is in use? [9i-85]
500 J/s of useful kinetic energy
500 J/s of useful potential energy
300 J/s of useful heat and 280 J/s of wasted potential energy
580 J/s of wasted heat energy
electrical
energy =>
useful/wasted energy outputs
input energy
transfers as a
370 J/s of useful kinetic energy
of 800 J/s to
food mixer
400 J/s of wasted heat energy
the appliance
is being used
? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 800 W). Which is the most likely missing quantity and form of output energy when the food mixer is in use? [9i-86]
30 J/s of wasted kinetic energy
30 J/s of wasted sound energy
20 J/s of useful heat energy
130 J/s of wasted heat energy
electrical
energy =>
useful/wasted energy outputs
input energy
transfers as a
2 J/s of useful kinetic energy
of 200 J/s
CD-HiFi system
192 J/s of wasted heat energy
to the
is being
5 J/s of useful sound energy
appliance
used
? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 200 W). Which is the most likely missing quantity and form of output energy when the CD-HiFi system is in use? [9i-87]
2 J/s of wasted light energy
2 J/s of wasted sound energy
1 J/s of useful light energy
1 J/s of useful heat energy
electrical
energy =>
useful/wasted energy outputs
input energy
transfers as a
4 J/s of useful kinetic energy
of 500 J/s
CD-HiFi system
2 J/s of useful light energy
to the
is being
464 J/s of wasted heat energy
appliance
used
? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 500 W). Which is the most likely missing quantity and form of output energy when the CD-HiFi system is in use? [9i-88]
30 J/s of wasted light energy
28 J/s of wasted sound energy
28 J/s of useful potential energy
30 J/s of useful sound energy
electrical
energy =>
useful/wasted energy outputs
input energy
transfers as a
3 J/s of useful kinetic energy
of 400 J/s
CD-HiFi system
1 J/s of useful light energy
to the
is being
20 J/s of useful sound energy
appliance
used
? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 400 W). Which is the most likely missing quantity and form of output energy when the CD-HiFi system is in use? [9i-89]
376 J/s of wasted heat energy
300 J/s of useful heat energy and 66 J/s of useful potential energy
376 J/s of useful potential energy
290 J/s of wasted sound energy and 76 J/s wasted kinetic energy
electrical
energy =>
useful/wasted energy outputs
input energy
transfers as a
287.5 J/s of wasted heat energy
of 300 J/s
CD-HiFi system
0.5 J/s of useful light energy
to the
is being
10.0 J/s of useful sound energy
appliance
used
? J/s of useful ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 300 W). Which is the most likely missing quantity and form of output energy when the CD-HiFi system is in use? [9i-90]
2.5 J/s of useful heat energy
2.0 J/s of useful kinetic energy
1.5 J/s of useful potential energy
1.5 J/s of wasted sound and 1.5 J/s wasted kinetic energy
electrical
energy =>
useful/wasted energy outputs
input energy
transfers as a
1200 J/s of useful kinetic energy
of 3000 J/s to
washing machine
10 J/s of wasted sound energy
the appliance
is being used
? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 3 kW). Which is the most likely missing quantity and form of output energy when the washing machine is in use? [9i-91]
1800 J/s of wasted kinetic energy
510 J/s of useful potential energy
500 J/s of useful potential and 10 J/s of wasted potential energy
510 J/s of useful kinetic energy
electrical
energy =>
useful/wasted energy outputs
input energy
transfers as a
5 J/s of wasted sound energy
of 2000 J/s to
washing machine
1485 J/s of useful/wasted heat energy
the appliance
is being used
? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 2 kW). Which is the most likely missing quantity and form of output energy when the washing machine is in use? [9i-92]
500 J/s of wasted kinetic energy
510 J/s of useful potential energy
500 J/s of useful potential and 10 J/s of wasted potential energy
510 J/s of useful kinetic energy
electrical
energy =>
useful/wasted energy outputs
input energy
transfers as a
900 J/s of kinetic energy
of 2500 J/s to
washing machine
1593 J/s of useful/wasted heat energy
the appliance
is being used
? J/s of ? energy
The table summarises what happens to the energy input and output of an electrical appliance (power rating 2.5 kW). Which is the most likely missing quantity and form of output energy when the washing machine is in use? [9i-93]