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

ELECTRICAL POWER

16 practice questions

Start practising (16 questions)

Practice questions

1–10 of 16

  1. Question 1

    1 mark · Easy

    State the unit used to measure electrical power.

    Answer and see the solution →

  2. Question 2

    1 mark · Easy

    Which of the following appliances is designed to use the heating effect of electric current?

    1. A.Electric kettle
    2. B.Television
    3. C.Table fan
    4. D.Doorbell
    Answer and check →

  3. Question 3

    1 mark · Easy

    Describe what is meant by the 'heating effect' of electrical current.

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  4. Question 4

    3 marks · Easy

    A 60 W lamp is switched on for 5 seconds.

    (a)

    State what the lamp’s power rating of 60 W means.

    [1 mark]
    (b)

    Calculate how much energy is transferred by the lamp in 5 seconds.

    [2 marks]
    Answer and see the solution →

  5. Question 5

    1 mark · Easy

    Give one example of an everyday appliance that uses the heating effect of electric current.

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  6. Question 6

    2 marks · Easy

    An electric heater is labelled 500 W. How much energy does it transfer in 8 seconds?

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  7. Question 7

    2 marks · Easy

    Explain why the wires inside an electric oven are designed to have high resistance.

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  8. Question 8

    1 mark · Easy

    Which statement best describes why a 100 W bulb is brighter than a 40 W bulb?

    1. A.It transfers more energy every second.
    2. B.It uses less current.
    3. C.It is bigger in size.
    4. D.It has a higher resistance.
    Answer and check →

  9. Question 9

    4 marks · Normal

    A hairdryer uses the heating effect of an electric current. The label on the hairdryer states 'Power: 1200 W'.

    (a)

    Explain how the heating effect of current is used in a hairdryer.

    [2 marks]
    (b)

    Calculate the energy transferred by the hairdryer in 5 minutes of use.

    [2 marks]
    Answer and see the solution →

  10. Question 10

    3 marks · Normal

    Two halogen bulbs are labelled 50 W and 70 W. Both are in use for 20 seconds. The bulbs convert electrical energy into heat and light.

    Energy transferred in 20 seconds
    BulbPower (W)Time (s)Energy (J)
    A5020
    B7020
    (a)

    Calculate the energy transferred by bulb A in 20 seconds.

    [1 mark]
    (b)

    Calculate the energy transferred by bulb B in 20 seconds.

    [1 mark]
    (c)

    Explain why bulb B is brighter than bulb A.

    [1 mark]
    Answer and see the solution →