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

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

• Check out your practical work you did or teacher demonstrations you observed, all of this is part of good revision for your module examination context questions and helps with 'how science works'.

  • reading the electricity meter at home on a daily or weekly basis where you may have looked for trends in usage and try to explain these, eg in terms of weather conditions - extra usage of heating systems in cold weather,

  • plan and carry out an investigation using an electrical joulemeter to measure the energy transferred by low voltage bulbs of different powers, low voltage motors and low voltage immersion heaters.

 WHERE NEXT?

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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