Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Mains Electricity
58 practice questions
Topics covered
Practice questions
21–28 of 28 · Easy
Question 21
2 marks · Easy
Answer and see the solution →State whether a solar panel and the mains supply provide direct current (d.c.) or alternating current (a.c.).
Question 22
3 marks · Easy
Answer and see the solution →A small heater is labelled 240 V, 50 W.
(a)[2 marks]Calculate the current in the heater.
(b)[1 mark]The heater is switched on for 3 minutes. Calculate the total energy transferred.
Question 23
1 mark · Easy
Answer and check →Which equation gives the total energy transferred when a current I flows through a potential difference V for a time t?
- A.E = I × V × t
- B.E = V / I × t
- C.E = t / (I × V)
- D.E = V × V × t
Question 24
1 mark · Easy
Answer and see the solution →State the meaning of direct current (d.c.).
Question 25
4 marks · Easy
Answer and see the solution →A student wants to use an electric kettle (rated at 1500 W) on a 230 V mains supply. She checks the plug, which is fitted with a 5 A fuse.
(a)[2 marks]Calculate the current taken by the kettle when it is switched on.
(b)[2 marks]Explain whether a 5 A fuse is suitable for this kettle.
Question 26
4 marks · Easy
Answer and see the solution →A student has a lamp that is fitted with a 3 A fuse and is connected to a 230 V mains supply. The lamp casing is made from metal.
(a)[2 marks]Explain why the lamp must be fitted with an earth wire.
(b)[2 marks]The lamp uses a current of 0.4 A. State whether the 3 A fuse is suitable for this lamp, giving a reason for your answer.
Question 27
4 marks · Easy
Answer and see the solution →A fan heater is rated at 2000 W and is connected to a 230 V mains supply. The heater has a plastic casing, with no earth wire.
(a)[2 marks]Calculate the current used by the heater.
(b)[2 marks]Explain why this appliance does not need an earth wire.
Question 28
4 marks · Easy
Answer and see the solution →A desk lamp is powered by batteries providing direct current (d.c.). A television is powered from the mains (a.c.) supply.
(a)[2 marks]State the difference between the current supplied by batteries and the current supplied by the mains.
(b)[2 marks]Explain why a fuse is used in the plug of the television.