GCSE Standard Questions: Electricity in the Home

Q17. John uses four electrical appliances for different lengths of time.

Look at the table below.

(a)

(i) Which appliance uses the most energy?

[1 mark]

(ii) Which appliance has cost the least to use?

[1 mark]

(b) Three electrical circuit components that are used in domestic appliances are the thermistor, variable resistor and LDR

Which of the components would be used in the following situations:

(i) Monitoring the position of a door

(ii) Turning on lights when it gets dark

(iii) Operating a heating system

[2 marks]

The potential difference across the bulb is 230V.

Calculate the energy transferred, giving your answer to 2 significant figures.

[4 marks]

(Total 8 marks)