Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
Electrical power
16 practice questions
Practice questions
1–10 of 16
Question 1
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 2
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 3
1 mark · Easy
Answer and see the solution →State the unit of electrical power.
Question 4
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 5
1 mark · Easy
Answer and see the solution →Explain why house wiring is designed to have low resistance.
Question 6
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?
Question 7
2 marks · Easy
Answer and see the solution →Some modern appliances, such as kettles, use double insulation. Explain what double insulation means and why it improves safety.
Question 8
2 marks · Easy
Answer and see the solution →An electric grill is connected to a 230 V supply and draws a current of 4.0 A. Calculate its power.
Question 9
3 marks · Normal
Answer and see the solution →An electric kettle operates from a 230 V supply and the current in the kettle is 10 A. Calculate the power of the kettle.
Question 10
3 marks · Normal
Answer and see the solution →Explain why appliances such as kettles and toasters have elements made of materials with high resistance, while the connecting wires in a circuit have low resistance.