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Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit

Electricity

249 practice questions

Start practising (121 questions)

Topics covered

Practice questions

51–60 of 121 · Easy

  1. Question 51

    1 mark · Easy

    What does double insulation in an electrical appliance mean?

    1. A.The appliance has two layers of metal casing
    2. B.Both the live and neutral wires are fused
    3. C.There are two protective layers of insulation around live parts
    4. D.It must be earthed for safety
    Answer and check →

  2. Question 52

    1 mark · Easy

    Name one household appliance (other than a kettle or toaster) that uses the heating effect of an electric current.

    (a)
    [1 mark]
    Answer and see the solution →

  3. Question 53

    1 mark · Easy

    Which of these statements best describes why the wire in a toaster becomes hot?

    1. A.The wire has a high resistance, causing energy to be transferred as heat.
    2. B.The wire is made from copper, which always gets hot.
    3. C.The wire has a low resistance, so it stays cool.
    4. D.The wire is thick, which increases its temperature.
    Answer and check →

  4. Question 54

    1 mark · Easy

    State the unit of electrical power.

    Answer and see the solution →

  5. Question 55

    2 marks · Easy

    A halogen desk lamp is rated at 24 V, 1.5 A.

    (a)

    Calculate the power output of the lamp.

    [2 marks]
    Answer and see the solution →

  6. Question 56

    1 mark · Easy

    Explain why house wiring is designed to have low resistance.

    Answer and see the solution →

  7. Question 57

    1 mark · Easy

    Table: Power ratings for different household bulbs
    BulbPower (W)
    A40
    B75
    C100
    D25

    Which bulb transfers the least electrical energy every second?

    Answer and see the solution →

  8. Question 58

    2 marks · Easy

    Some modern appliances, such as kettles, use double insulation. Explain what double insulation means and why it improves safety.

    Answer and see the solution →

  9. Question 59

    2 marks · Easy

    An electric grill is connected to a 230 V supply and draws a current of 4.0 A. Calculate its power.

    Answer and see the solution →

  10. Question 60

    1 mark · Easy

    Which of these is a feature of an alternating current (a.c.) supply?

    1. A.The current changes direction repeatedly.
    2. B.The current only flows in one direction.
    3. C.The voltage stays constant at all times.
    4. D.The voltage is provided by a battery.
    Answer and check →