Lesson 4.2.1.3

4.2.1.3 Current, resistance and potential difference Quiz: AQA Physics, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.2.1.3, Current, resistance and potential difference: 20 multiple choice questions for the AQA GCSE Physics (8463), Unit 2: Electricity, written with Revision Ninja.

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The 20 questions

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

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

  2. What is the unit of resistance?

    • Coulomb (C)
    • Ohm (ohm symbol)
    • Ampere (A)
    • Volt (V)

  3. What happens to current when resistance increases at a fixed potential difference?

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

  4. A component has a resistance of 4 ohms and a current of 2 A. What is the potential difference across it?

    • 0.5 V
    • 6 V
    • 8 V
    • 2 V

  5. A 12 V supply is connected across a resistor of 6 ohms. What current flows?

    • 18 A
    • 0.5 A
    • 72 A
    • 2 A

  6. A current of 0.4 A flows through a resistor with 30 V across it. What is its resistance?

    • 30.4 ohms
    • 0.013 ohms
    • 12 ohms
    • 75 ohms

  7. What happens to current if potential difference stays constant and resistance doubles?

    • It doubles
    • It halves
    • It stays constant
    • It quadruples

  8. A resistor carries 0.2 A when the potential difference is 5 V. What potential difference gives 0.5 A through the same resistor?

    • 25 V
    • 12.5 V
    • 5 V
    • 2 V

  9. Which graph shape shows that a resistor obeys Ohm's law at constant temperature?

    • U-shaped curve
    • Straight line through origin
    • Horizontal flat line
    • Curved line upwards

  10. The current through a component is 3 A when the potential difference is 9 V. What is the resistance?

    • 12 ohms
    • 3 ohms
    • 0.33 ohms
    • 27 ohms

  11. What is the relationship between resistance and current for a fixed potential difference?

    • Directly proportional
    • Unrelated
    • Exponential
    • Inversely proportional

  12. A student measures 1.5 V across a component carrying 0.3 A. What is the resistance?

    • 1.8 ohms
    • 45 ohms
    • 5 ohms
    • 0.2 ohms

  13. A lamp draws 0.25 A from a 6 V supply, compared to 0.5 A for a first lamp. What is its resistance?

    • The same
    • Four times larger
    • Twice as large
    • Half as large

  14. Which quantity is kept constant when investigating the I-V characteristic of a resistor?

    • Current
    • Potential difference
    • Temperature
    • Resistance

  15. A potential difference of 230 V drives a current of 10 A through a heater. What is its resistance?

    • 0.043 ohms
    • 23 ohms
    • 2300 ohms
    • 240 ohms

  16. A component's resistance is 50 ohms. How much current flows when 25 V is applied?

    • 1250 A
    • 2 A
    • 75 A
    • 0.5 A

  17. What term is synonymous with potential difference in GCSE exam questions?

    • Voltage
    • Resistance
    • Current
    • Power

  18. A resistor of 8 ohms has 16 V across it. What is the current?

    • 0.5 A
    • 24 A
    • 128 A
    • 2 A

  19. Does the equation V = I R still apply to a non-ohmic component like a thermistor?

    • Only when cold
    • No, never
    • Yes, with constant R
    • Yes, with changing R

  20. A student records current 0.8 A at 4 V and 1.6 A at 8 V for the same resistor. What is the resistance?

    • 5 ohms
    • 10 ohms
    • 3.2 ohms
    • 0.2 ohms

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