Lesson 3.5.1.4

3.5.1.4 Circuits Quiz: AQA Physics, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.5.1.4, Circuits: 20 multiple choice questions for the AQA Physics (7408), Unit 5: Electricity, written with Revision Ninja.

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The 20 questions

  1. For resistors in series, the total resistance is given by:

    • R_T = (R1 + R2) / 2
    • 1/R_T = 1/R1 + 1/R2 + 1/R3 + ...
    • R_T = R1 x R2 x R3
    • R_T = R1 + R2 + R3 + ...

  2. For resistors in parallel, the total resistance is given by:

    • R_T = (R1 + R2 + R3) / 3
    • R_T = R1 + R2 + R3 + ...
    • R_T = R1 x R2 x R3
    • 1/R_T = 1/R1 + 1/R2 + 1/R3 + ...

  3. Two 6.0 ohm resistors are connected in parallel. What is their combined resistance?

    • 12 ohm
    • 0.33 ohm
    • 6.0 ohm
    • 3.0 ohm

  4. In a series circuit, the current through each component is:

    • the same through every component
    • shared between the components in proportion to resistance
    • zero in all but the first component
    • largest in the component with the greatest resistance

  5. In a parallel circuit, the potential difference across each branch is:

    • shared in proportion to each branch's resistance
    • equal to the supply potential difference
    • zero across the branch with the lowest resistance
    • equal to the sum of the branch potential differences

  6. Which expression gives the power dissipated in a resistor?

    • P = I^2 / R
    • P = V R
    • P = I R^2
    • P = I^2 R

  7. In a dc series circuit, the sum of the potential differences across all components equals:

    • the emf of the supply
    • zero
    • the current in the circuit
    • twice the emf of the supply

  8. A series circuit has resistors of 4.0 ohm, 6.0 ohm and 2.0 ohm, and a 12 V supply. What is the current?

    • 3.0 A
    • 0.5 A
    • 2.0 A
    • 1.0 A

  9. Resistors of 3.0 ohm and 6.0 ohm are connected in parallel across a 6.0 V supply. What is the total current from the supply?

    • 1 A
    • 3 A
    • 2 A
    • 9 A

  10. Two identical cells, each of emf 1.5 V, are connected in parallel. What is the total emf of the combination?

    • 0.75 V
    • 1.5 V
    • 4.5 V
    • 3.0 V

  11. Two identical 1.5 V cells are connected in series with a 6.0 ohm resistor. What is the current? Ignore internal resistance.

    • 0.25 A
    • 1.0 A
    • 0.50 A
    • 4.5 A

  12. A 5.0 ohm resistor carries a current of 2.0 A. What power is dissipated?

    • 2.5 W
    • 10 W
    • 20 W
    • 40 W

  13. A 12 V supply drives a current of 2.0 A for 5.0 minutes. What is the energy transferred?

    • 3.6 kJ
    • 72 kJ
    • 7.2 kJ
    • 0.12 kJ

  14. A 6.0 ohm resistor is in series with a 3.0 ohm and 6.0 ohm resistor in parallel, all across a 12 V supply. What is the current from the supply?

    • 0.67 A
    • 3.0 A
    • 1.5 A
    • 2.0 A

  15. Two lamps are in parallel across a 12 V supply. One has a resistance of 4.0 ohm and the other 6.0 ohm. What is the total current from the supply?

    • 8 A
    • 2 A
    • 1.2 A
    • 5 A

  16. Identical lamps are connected in series. If one lamp filament breaks, the others:

    • flicker but stay lit
    • stay lit at full brightness
    • all go out, because the circuit is broken
    • glow brighter because the current increases

  17. In a circuit, a 9.0 V cell drives a 4.0 ohm resistor in series with a parallel pair of 6.0 ohm and 3.0 ohm resistors. What is the current through the 3.0 ohm resistor?

    • 0.5 A
    • 3.0 A
    • 1.0 A
    • 1.5 A

  18. In the circuit in which a 4.0 ohm resistor is in series with the parallel pair of 6.0 ohm and 3.0 ohm, the supply is 9.0 V. What is the power in the 4.0 ohm resistor?

    • 4.5 W
    • 18 W
    • 9 W
    • 13.5 W

  19. A student says two identical resistors in parallel have twice the resistance of one. Which response is best?

    • Yes, adding more resistors always increases the resistance.
    • No, they have the same resistance as one, because the pd is shared.
    • Yes, parallel branches add resistances directly.
    • No, two identical resistors in parallel give half the resistance of one, because the current has two paths.

  20. In a series circuit with a 10 V supply, two components have pds of 3 V and 5 V. What is the pd across the third component?

    • 8 V
    • 10 V
    • 2 V
    • 3 V

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