Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Mains Electricity
58 practice questions
Topics covered
Practice questions
21–30 of 58
Question 21
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 22
1 mark · Easy
Answer and see the solution →Explain why house wiring is designed to have low resistance.
Question 23
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 24
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 25
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 26
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 27
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.
Question 28
1 mark · Normal
Answer and check →Which of the following light bulbs transfers the most electrical energy every second?
- A.A 30 W bulb
- B.A 50 W bulb
- C.A 60 W bulb
- D.A 70 W bulb
Question 29
4 marks · Normal
Answer and see the solution →A student is choosing the correct fuse for a 1200 W hairdryer powered by a 240 V mains supply.
(a)[2 marks]Calculate the current drawn by the hairdryer.
(b)[2 marks]Suggest which fuse rating would be suitable: 3 A, 5 A, or 13 A. Explain your answer.
Question 30
2 marks · Normal
Answer and see the solution →State the equation linking power, current, and voltage. Define what each of the symbols stands for.