Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Electricity
249 practice questions
Topics covered
Practice questions
41–50 of 121 · Easy
Question 41
4 marks · Easy
Answer and see the solution →The information panel on an electric toaster says: 'Power: 800 W, Voltage: 200 V'. The plug has a fuse fitted.
(a)[2 marks]Calculate the current drawn by the toaster when it is working.
(b)[2 marks]Suggest which fuse should be used in the plug if the available sizes are 3 A and 5 A. Explain your answer.
Question 42
4 marks · Easy
Answer and see the solution →The diagram shows a simple circuit with a lamp powered by a battery.
Circuit containing a battery (12 V), a lamp, and an ammeter in series. The ammeter reads 0.5 A. (a)[2 marks]Calculate the energy transferred by the lamp in 60 seconds.
(b)[2 marks]State the amount of electric charge that passes through the lamp in 60 seconds.
Question 43
4 marks · Easy
Answer and see the solution →A brand-new electric iron is labelled '230 V, 1200 W'. It has a metal case and is connected to the mains by a three-core cable.
(a)[2 marks]State the purpose of the earth wire in this appliance.
(b)[2 marks]If the iron is switched on for 3 minutes, calculate the total energy transferred to it.
Question 44
3 marks · Easy
Answer and see the solution →A student is learning how different safety features protect a user of an electrical appliance.
(a)[1 mark]State the purpose of a fuse in an electrical plug.
(b)[1 mark]What happens to the fuse if too much current flows through the circuit?
(c)[1 mark]Explain how this helps keep the user safe.
Question 45
1 mark · Easy
Answer and check →Which part of a UK three-pin plug is made of plastic for safety?
- A.The casing
- B.The live pin
- C.The earth pin
- D.The fuse
Question 46
1 mark · Easy
Answer and see the solution →Name the wire in a plug that carries current away from the appliance and back to the supply.
Question 47
2 marks · Easy
Answer and see the solution →Look at the diagram of a simple mains circuit with a lamp, fuse, and earth wire.
Simplified circuit showing live wire, neutral wire, fuse, lamp, and earth wire. (a)[1 mark]Explain why the earth wire is connected to metal casings.
(b)[1 mark]State what would happen if the live wire inside the appliance touched the metal casing.
Question 48
1 mark · Easy
Answer and see the solution →Why do modern appliances with plastic casings not require an earth wire?
Question 49
2 marks · Easy
Answer and see the solution →A hairdryer is rated at 4 A. The plug contains a 3 A, 5 A and 13 A fuse.
(a)[1 mark]Which fuse is the most suitable to use?
(b)[1 mark]Explain your answer.
Question 50
1 mark · Easy
Answer and see the solution →Give one advantage of a circuit breaker over a fuse.