GCSE Standard Questions: Electricity in the Home

Q9. The diagram shows a microwave oven.

(a) The microwave oven is connected to the mains electricity supply using a three-core cable and plug. Explain why a three-core cable must be used and not a two-core cable.

[2 marks]

(b) The microwave oven draws a current of 3.3 amps from the mains electricity supply.

(i) Which one of the above fuses should be used inside the plug?

Explain why you have chosen a fuse of that value.

[2 marks]

(ii) The microwave oven is used to cook a meal.

The microwave oven is switched on for 300 seconds.

During this time 225,000 J of energy are transferred from the mains electricity supply to the oven.

Calculate the power of the microwave oven.

[3 marks]


(Total 7 marks)