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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Electrical circuits

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Electrical circuits

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Paper 3Theory (Core)2 marks

Calculating total resistance in a series circuit.

Description

Series Circuit with Resistors

A circuit contains three resistors connected in series: R1 = 4Ω, R2 = 6Ω, and R3 = 10Ω.

  1. a

    Calculate the total resistance of the circuit.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Electrical circuits

Paper 3Theory (Core)3 marks

Description

Impact of Adding Resistors

Consider a series circuit with two resistors, R1 = 5Ω and R2 = 15Ω. What happens if a third resistor, R3 = 10Ω, is added?

  1. a

    Discuss the effect on total resistance when R3 is added to the circuit.

    Aim for approximately 3 distinct marking points.

    [3]