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

ALTERNATING CURRENT AND DIRECT CURRENT

16 practice questions

Start practising (16 questions)

Practice questions

1–10 of 16

  1. Question 1

    1 mark · Easy

    State the unit of energy transferred in an electric circuit.

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  2. Question 2

    1 mark · Easy

    Which of the following best describes direct current (d.c.)?

    1. A.A current that constantly changes direction and size.
    2. B.A current that is always in the same direction with a constant value.
    3. C.A current that is always zero.
    4. D.A current that reverses direction every second.
    Answer and check →

  3. Question 3

    2 marks · Easy

    A small fan operates at a power of 10 W. How much energy does it transfer in 3 minutes?

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  4. Question 4

    3 marks · Easy

    A torch uses a battery to provide electricity to a bulb.

    (a)

    State whether the current from the battery is alternating current (a.c.) or direct current (d.c.).

    [1 mark]
    (b)

    Give a reason for your answer.

    [2 marks]
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  5. Question 5

    2 marks · Easy

    A small electric pump transfers 4800 J of energy in 4 minutes. Calculate the power of the pump.

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  6. Question 6

    2 marks · Easy

    A 30 W charger is used for 2 hours.

    (a)

    Calculate the total energy transferred in joules.

    [2 marks]
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  7. Question 7

    1 mark · Easy

    Which device supplies alternating current (a.c.) in a home?

    1. A.A torch battery
    2. B.A solar cell
    3. C.The mains electricity socket
    4. D.A chemical cell
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  8. Question 8

    1 mark · Easy

    State the equation linking energy transferred (E), power (P), and time (t) in an electric circuit.

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  9. Question 9

    4 marks · Normal

    A table lamp is rated at 60 W and is connected to a 240 V mains supply.

    (a)

    Calculate the current in the lamp when it is operating at full power.

    [2 marks]
    (b)

    Calculate the energy transferred if the lamp is left on for 30 minutes.

    [2 marks]
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  10. Question 10

    1 mark · Normal

    Which of the following best describes alternating current (a.c.) as opposed to direct current (d.c.)?

    1. A.A current that is always in the same direction and constant size.
    2. B.A current that regularly reverses direction and changes size with time.
    3. C.A current supplied only by batteries and cells.
    4. D.A current supplied only by power stations.
    Answer and check →