Lesson T5.1.2

T5.1.2 Potential difference and resistance Quiz: KS3 Physics, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T5.1.2, Potential difference and resistance: 20 multiple choice questions for the KS3 Physics (National Curriculum), Unit 5: Electricity and magnetism, written with Revision Ninja.

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The 20 questions

  1. What fundamental physical quantity does electrical potential difference measure?

    • Charge per second
    • Energy per charge
    • Power per time
    • Resistance per length

  2. What is the standard unit of potential difference?

    • Volt
    • Watt
    • Ampere
    • Coulomb

  3. How is electrical resistance calculated from voltage and current?

    • Voltage divided by current
    • Current squared times voltage
    • Current divided by voltage
    • Voltage multiplied by current

  4. What is the resistance of a component with 6 V and 2 A?

    • 12 ohms
    • 3 ohms
    • 4 ohms
    • 0.33 ohms

  5. What is the potential difference across a 4 ohm resistor with 3 A?

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

  6. How should a voltmeter be connected into an electrical circuit?

    • In a closed loop
    • In series
    • In parallel
    • Directly to earth

  7. What is the standard UK domestic mains voltage?

    • 12 V
    • 100 V
    • 230 V
    • 400 V

  8. Which of these is the official unit of resistance?

    • Ohm
    • Watt
    • Siemens
    • Joule

  9. How is battery voltage distributed between two identical lamps connected in series?

    • Shared equally
    • Zero across each
    • Doubled each
    • Concentrated fully

  10. What is the potential difference across each parallel branch compared to the supply?

    • Double the supply
    • Equal to supply
    • Half the supply
    • Zero

  11. What is the resistance of a bulb rated 6 V and 0.5 A?

    • 12 Ω
    • 30 Ω
    • 3 Ω
    • 6 Ω

  12. What does a battery voltage represent in terms of charge?

    • Energy per coulomb
    • Current per coulomb
    • Power per coulomb
    • Resistance per coulomb

  13. What happens to the circuit current if resistance is doubled at constant voltage?

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

  14. Which term describes how strongly a component opposes electrical current?

    • Resistance
    • Current
    • Voltage
    • Power

  15. What is the resistance of a resistor with a 10 V p.d. and 0.2 A current?

    • 5 Ω
    • 2 Ω
    • 200 Ω
    • 50 Ω

  16. How is battery voltage shared between two identical resistors in series?

    • Shared equally
    • Divided unevenly
    • Zero on each
    • Doubled on each

  17. What is the potential difference across a 2 Ω resistor with a 0.5 A current?

    • 1 V
    • 4 V
    • 1.5 V
    • 0.25 V

  18. Which type of wire has a higher electrical resistance?

    • Wide wire
    • Thin wire
    • Thick wire
    • Short wire

  19. What is the resistance of a component with 9 V p.d. and 3 A current?

    • 12 Ω
    • 3 Ω
    • 6 Ω
    • 27 Ω

  20. What is the power of a bulb working at 12 V and 2 A?

    • 24 W
    • 6 W
    • 14 W
    • 48 W

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