Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
MAINS ELECTRICITY
15 practice questions
Practice questions
1–7 of 7 · Normal
Question 1
1 mark · Normal
Answer and see the solution →What is the function of the live wire in a domestic mains circuit?
Question 2
1 mark · Normal
Answer and see the solution →State why the casing of a plug is made from plastic.
Question 3
1 mark · Normal
Answer and check →Which device is designed to automatically switch off the circuit if the current becomes too large?
- A.fuse
- B.resistor
- C.circuit breaker
- D.transformer
Question 4
2 marks · Normal
Answer and see the solution →Explain why it is dangerous if the earth wire in a metal-cased appliance is disconnected.
Question 5
3 marks · Normal
Answer and see the solution →A kettle operates at 230 V and is protected by a fuse.
(a)[1 mark]State the correct unit for each of the following: electrical current, electric charge, and electric potential difference.
(b)[2 marks]If the kettle normally draws a current of 8.5 A, which size of fuse should be used: 5 A, 13 A, or 20 A? Explain your answer.
Question 6
2 marks · Normal
Answer and see the solution →Explain how double insulation protects the user of a domestic electrical appliance.
Question 7
4 marks · Normal
Answer and see the solution →A hairdryer is connected to the mains. The diagram shows a simplified circuit with a fuse.
(a)[2 marks]Name two energy transfers that take place when the hairdryer is used.
(b)[2 marks]Explain what happens to the fuse if the heating element develops a short circuit.