Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Electricity
249 practice questions
Topics covered
Practice questions
61–70 of 121 · Easy
Question 61
3 marks · Easy
Answer and see the solution →A torch bulb is connected to a battery that supplies a voltage of 4.5 V and a current of 0.2 A.
(a)[1 mark]Calculate the power of the bulb.
(b)[2 marks]The bulb is turned on for 10 minutes. Calculate the total energy transferred.
Question 62
2 marks · Easy
Answer and see the solution →Explain the difference between the voltage graph of an alternating current (a.c.) and a direct current (d.c.) supply.
Question 63
1 mark · Easy
Answer and check →A mobile phone battery provides a current of 1.5 A at a voltage of 3.7 V. Calculate the power supplied by the battery.
Question 64
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 65
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 66
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 67
1 mark · Easy
Answer and see the solution →State the meaning of direct current (d.c.).
Question 68
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 69
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 70
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.