Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Electricity
249 practice questions
Topics covered
Practice questions
101–110 of 249
Question 101
4 marks · Normal
Answer and see the solution →A kitchen kettle is fitted with a 13 A fuse. The table below shows the fuses available and their ratings:
Fuse ratings for domestic use Fuse Rating (A) A 3 B 5 C 13 (a)[2 marks]Explain why the fuse should be rated just above the normal working current of the kettle.
(b)[2 marks]State and explain what would happen if someone used the 3 A fuse instead of the 13 A fuse in the kettle.
Question 102
4 marks · Normal
Answer and see the solution →The diagram below shows a lamp connected to the mains supply with a metal casing. The circuit includes a fuse and an earth wire.
(a)[1 mark]A simple mains circuit with metal-cased lamp (b)[3 marks]Explain what happens if a fault causes the live wire to touch the metal casing of the lamp.
Question 103
4 marks · Normal
Answer and see the solution →A manufacturer decides to use a plastic casing for a new electric hand mixer. The mixer is labeled 'double insulated'.
(a)[2 marks]Describe what is meant by double insulation in this context.
(b)[2 marks]Explain why an earth wire is not needed for this appliance.
Question 104
3 marks · Normal
Answer and see the solution →An electric fan develops a fault and starts drawing a current much higher than normal. It is fitted with a fuse in the plug.
(a)[2 marks]Explain how the fuse protects the circuit and user in this situation.
(b)[1 mark]Describe what must be done before the fan can be used again after the fuse blows.
Question 105
1 mark · Easy
Answer and see the solution →Name one household appliance (other than a kettle or toaster) that uses the heating effect of an electric current.
(a)[1 mark]Question 106
1 mark · Easy
Answer and check →Which of these statements best describes why the wire in a toaster becomes hot?
- A.The wire has a high resistance, causing energy to be transferred as heat.
- B.The wire is made from copper, which always gets hot.
- C.The wire has a low resistance, so it stays cool.
- D.The wire is thick, which increases its temperature.
Question 107
1 mark · Easy
Answer and see the solution →State the unit of electrical power.
Question 108
2 marks · Easy
Answer and see the solution →A halogen desk lamp is rated at 24 V, 1.5 A.
(a)[2 marks]Calculate the power output of the lamp.
Question 109
1 mark · Easy
Answer and see the solution →Explain why house wiring is designed to have low resistance.
Question 110
1 mark · Easy
Answer and see the solution →Table: Power ratings for different household bulbs Bulb Power (W) A 40 B 75 C 100 D 25 Which bulb transfers the least electrical energy every second?