Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Mains Electricity
58 practice questions
Topics covered
Practice questions
11–20 of 28 · Easy
Question 11
1 mark · Easy
Answer and see the solution →State the unit of electrical power.
Question 12
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 13
1 mark · Easy
Answer and see the solution →Explain why house wiring is designed to have low resistance.
Question 14
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 15
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 16
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 17
1 mark · Easy
Answer and check →Which of these is a feature of an alternating current (a.c.) supply?
- A.The current changes direction repeatedly.
- B.The current only flows in one direction.
- C.The voltage stays constant at all times.
- D.The voltage is provided by a battery.
Question 18
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 19
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 20
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.