Students should be able to:
- describe the use of the heating effect of electricity in appliances such as electric kettles, ovens and heaters
- recall and apply the relationships P = V I and E = V It to new situations or to solve related problems
- calculate the cost of using electrical appliances where the energy unit is the kW h
- state the hazards of using electricity in the following situations:
- damaged insulation
- overheating of cables
- damp conditions
- explain the use of fuses and circuit breakers in electrical circuits and of fuse ratings
- explain the need for earthing metal casings and for double insulation
- state the meaning of the terms live, neutral and earth
- describe the wiring in a mains plug
- explain why switches, fuses, and circuit breakers are fitted to the live wire.