Lesson 6.2.1.3

6.2.1.3 Current, resistance and potential difference Quiz: AQA Combined Science, Unit 19

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 6.2.1.3, Current, resistance and potential difference: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 19: Electricity, written with Revision Ninja.

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The 20 questions

  1. Which equation links potential difference, current and resistance?

    • V = I R
    • V = I + R
    • V = R / I
    • V = I / R

  2. What is the unit of resistance?

    • Coulomb
    • Ohm
    • Volt
    • Ampere

  3. What is the unit of potential difference?

    • Ohm
    • Watt
    • Ampere
    • Volt

  4. For a fixed potential difference, what happens to current if resistance increases?

    • Current increases
    • Current stays constant
    • Current drops to zero
    • Current decreases

  5. Which term is officially used in exam questions for electrical supply?

    • Potential difference
    • Electric pressure
    • Voltage drop
    • Charge force

  6. What two factors determine the current through an electrical component?

    • Current and charge
    • Power and energy
    • Time and resistance
    • Resistance and potential difference

  7. Which symbol stands for resistance?

    • P
    • R
    • E
    • Q

  8. Which quantity is measured in amperes?

    • Resistance
    • Potential difference
    • Charge
    • Current

  9. A current of 0.25 A flows through a 40 ohm resistor. What is the potential difference?

    • 160 V
    • 0.006 V
    • 40 V
    • 10 V

  10. A potential difference of 12 V gives a current of 0.6 A. What is the resistance?

    • 7.2 ohms
    • 20 ohms
    • 12.6 ohms
    • 0.05 ohms

  11. A 6 V supply is across a 3 ohm resistor. What is the current?

    • 3 A
    • 0.5 A
    • 18 A
    • 2 A

  12. A pd of 9 V across a resistor gives a current of 1.5 A. What is the resistance?

    • 13.5 ohms
    • 0.17 ohms
    • 10.5 ohms
    • 6 ohms

  13. What happens to current if potential difference is doubled at constant resistance?

    • It halves
    • It doubles
    • It stays the same
    • It quadruples

  14. A lamp has 12 V across it and carries 0.5 A. What is its resistance?

    • 6 ohms
    • 12.5 ohms
    • 0.04 ohms
    • 24 ohms

  15. A 3 A current flows through a 4 ohm resistor. What is the potential difference?

    • 12 V
    • 1.33 V
    • 0.75 V
    • 7 V

  16. A pd of 20 V drives 500 mA through a component. What is its resistance?

    • 0.025 ohms
    • 10 ohms
    • 400 ohms
    • 40 ohms

  17. A component has a pd of 3 V and a current of 15 mA. What is its resistance?

    • 45 ohms
    • 200 ohms
    • 0.005 ohms
    • 2000 ohms

  18. A graph of V against I is a straight line through the origin. What does its gradient represent?

    • Resistance
    • Power
    • Charge
    • Energy

  19. Which resistor carries more current for the same potential difference?

    • Higher resistance
    • Equal resistance
    • Lower resistance
    • Zero resistance

  20. What is the resistance of a component if a potential difference of 8 V drives 0.2 A?

    • 40 ohms
    • 1.6 ohms
    • 0.025 ohms
    • 80 ohms

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