ELECTRICITY Section 1:
Useful electrical appliances in the home, safety fuses and earthing, transferring electrical energy
in the home
ALSO
power
and energy transfer calculations including
P = IV = I2R = E/t, E = Pt =
IVt and electricity cost
calculations
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Doc Brown's school physics revision notes: GCSE
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Why are electrical devices so useful? How do we calculate the energy transfers in an electrical appliance? What do we mean by a unit of electricity
used? How do we calculate the cost of running an
electrical device?
Sub-index for this section on electricity in the home
1.
Important
definitions, descriptions, formulae and units for electrical science
2.
The usefulness of electrical appliances
in the home
3.
The
a.c. electricity supply to the home, wiring, insulation, and plugs
(more on safety in Part 5.)
4.
Power
ratings of appliances in the home and rate of energy transfer
5.
More
on the dangers of the live wire, fuses and earthing appliances for extra
safety
6.
Power, energy transfer and
electricity cost calculation QUESTIONS
7.
Power, energy transfer and
electricity cost calculation ANSWERS
See also Electricity Part 3 for
more on
V = IR, Q = It and E = QV
calculations
and
Types of energy and stores - examples compared and explained
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Electricity and
magnetism revision
notes index
1.
Usefulness of electricity, safety, energy transfer, cost & power calculations, P = IV = I2R,
E = Pt, E=IVt
2.
Electrical circuits and how to draw them, circuit symbols, parallel
circuits, series circuits explained
3. Ohm's Law, experimental investigations of
resistance, I-V graphs, calculations V = IR, Q = It, E = QV
4. Circuit devices and how are they used? (e.g.
thermistor and LDR), relevant graphs
5. More on series and parallel circuits,
circuit diagrams, measurements and calculations
6. The 'National Grid' power supply, environmental
issues, use of transformers
7.
Comparison of methods of generating electricity (= energy
part 6)
8. Static electricity and electric fields, uses
and dangers of static electricity
9.
Magnetism
- magnetic materials - temporary (induced) and permanent magnets - uses
10.
Electromagnetism, solenoid coils, uses of electromagnets
11. Motor effect of an electric current,
electric motor, loudspeaker, Fleming's left-hand rule, F = BIL
12.
Generator effect, applications e.g. generators
generating electricity and microphone
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studying P = IV P = I2R electricity calculations explaining the
usefulness of electrical appliances, calculations on
transferring electrical energy using the power formula,
household cost calculations, the need for electrical safety in
the home, how to wire a plug wire, what do the colours mean on
the electrical cable insulation igcse gcse physics Important electricity definitions,
descriptions, formulae and units examples of the usefulness of
electrical appliances e.g. in the home, describing the uses of
electricity in the home including safety aspects - plugs, power
ratings e.g. appliances in the home, the dangers of the live
wire, fuses and need for earthing appliances for extra safety,
calculations involving power, energy transfer and electricity
cost calculations

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