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

Mains Electricity

58 practice questions

Start practising (58 questions)

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Practice questions

31–40 of 58

  1. Question 31

    3 marks · Normal

    Some light bulbs get hot in normal use. A student wants to design a test to compare the heating effect of two bulbs with different resistances.

    (a)

    State one control variable needed for a fair test.

    [1 mark]
    (b)

    Suggest a measurement the student could take to compare the heating effect.

    [1 mark]
    (c)

    Explain the expected result if one bulb has a higher resistance than the other.

    [1 mark]
    Answer and see the solution →

  2. Question 32

    4 marks · Normal

    A table shows data for three different toasters:

    Toaster Data
    ToasterVoltage (V)Current (A)
    X2303.0
    Y2304.0
    Z2305.0
    (a)

    Calculate the power rating for each toaster.

    [3 marks]
    (b)

    State which toaster would get hottest the quickest and explain why.

    [1 mark]
    Answer and see the solution →

  3. Question 33

    2 marks · Normal

    Traditional light bulbs are described as inefficient. Explain what this means, in terms of energy transfer, and why they are being replaced by LEDs.

    Answer and see the solution →

  4. Question 34

    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 →

  5. Question 35

    3 marks · Easy

    A torch bulb is connected to a battery that supplies a voltage of 4.5 V and a current of 0.2 A.

    (a)

    Calculate the power of the bulb.

    [1 mark]
    (b)

    The bulb is turned on for 10 minutes. Calculate the total energy transferred.

    [2 marks]
    Answer and see the solution →

  6. Question 36

    2 marks · Easy

    Explain the difference between the voltage graph of an alternating current (a.c.) and a direct current (d.c.) supply.

    Answer and see the solution →

  7. Question 37

    1 mark · Easy

    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.

    Answer and check →

  8. Question 38

    2 marks · Easy

    State whether a solar panel and the mains supply provide direct current (d.c.) or alternating current (a.c.).

    Answer and see the solution →

  9. Question 39

    3 marks · Easy

    A small heater is labelled 240 V, 50 W.

    (a)

    Calculate the current in the heater.

    [2 marks]
    (b)

    The heater is switched on for 3 minutes. Calculate the total energy transferred.

    [1 mark]
    Answer and see the solution →

  10. Question 40

    1 mark · Easy

    Which equation gives the total energy transferred when a current I flows through a potential difference V for a time t?

    1. A.E = I × V × t
    2. B.E = V / I × t
    3. C.E = t / (I × V)
    4. D.E = V × V × t
    Answer and check →