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Cambridge IGCSE Physics practice

Paper 3 structured question: Series and parallel circuits

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Series and parallel circuits

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Paper 3Theory (Core)1 marks

Understanding parallel circuits is essential for electrical engineering.

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Parallel Resistors

Two resistors, R1 = 8Ω and R2 = 12Ω, are connected in parallel. Calculate the total resistance of the circuit.

  1. a

    State the formula used to calculate total resistance in parallel circuits.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Series and parallel circuits

Paper 3Theory (Core)2 marks

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Effect of Adding Resistors

If a 10Ω resistor is added in parallel to an existing 20Ω resistor, determine the new total resistance.

  1. a

    State the new total resistance after adding the resistor.

    Aim for approximately 2 distinct marking points.

    [2]