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

ELECTRICAL RESISTANCE

16 practice questions

Start practising (8 questions)

Practice questions

1–8 of 8 · Normal

  1. Question 1

    3 marks · Normal

    An electric heater draws a current of 2.5 A when a voltage of 60 V is applied across it.

    (a)

    State the equation that relates voltage, current and resistance.

    [1 mark]
    (b)

    Calculate the resistance of the heater. Include units.

    [2 marks]
    Answer and see the solution →

  2. Question 2

    3 marks · Normal

    A lamp in a circuit has a resistance of 15 Ω. The potential difference across the lamp is 6.0 V.

    Calculate the current passing through the lamp. Show your working and give the unit.

    Answer and see the solution →

  3. Question 3

    2 marks · Normal

    Explain why connecting wires in a circuit are normally assumed to have zero resistance.

    Answer and see the solution →

  4. Question 4

    3 marks · Normal

    The diagram below shows a circuit with a battery and two resistors connected in series.

    Series circuit: battery, resistor, resistor12 V8 Ω6 Ω
    Series circuit with two resistors
    (a)

    Calculate the total resistance in the circuit.

    [1 mark]
    (b)

    Calculate the current in the circuit. Show your working.

    [2 marks]
    Answer and see the solution →

  5. Question 5

    3 marks · Normal

    A student measures the voltage and current across a piece of wire in an experiment. The results are shown in the table.

    Current and Voltage for a piece of wire
    Voltage (V)Current (A)
    0.00.0
    0.50.12
    1.00.25
    1.50.37
    2.00.50

    On graph paper, plot a graph of current (y-axis) against voltage (x-axis). Draw the best-fit straight line and label both axes with units.

    Answer and see the solution →

  6. Question 6

    1 mark · Normal

    What is the unit of electrical resistance?

    1. A.Ampere
    2. B.Ohm
    3. C.Volt
    4. D.Watt
    Answer and check →

  7. Question 7

    3 marks · Normal

    Describe an experiment you could carry out to investigate how the current in a wire changes as the voltage across it increases. Include the circuit used, what you would measure, and how you would present the results.

    Answer and see the solution →

  8. Question 8

    3 marks · Normal

    A piece of wire in a circuit has a current of 0.30 A flowing through it. The resistance of the wire is 18 Ω.

    Calculate the voltage across the wire. Give your answer with the correct unit.

    Answer and see the solution →