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Cambridge IGCSE Combined Science practice

Paper 4 structured question: Electrical quantities

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Electrical quantities

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Paper 4Theory (Extended)3 marks

A metallic conductor has a length of 3 meters and a cross-sectional area of 1.5 mm². The resistivity of the material is 2.5 x 10^-8 ohm meters.

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Calculating Resistance

Using the formula R = ρ(L/A), calculate the resistance of the conductor.

  1. a

    Calculate the resistance of the conductor.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: Electrical quantities

Paper 4Theory (Extended)2 marks

Description

Resistance of Wires

The student measures the resistance of both wires and records the results. Wire A has a resistance of 4 ohms, while Wire B has a resistance of 8 ohms.

  1. a

    Compare the resistances of Wire A and Wire B based on their lengths and cross-sectional areas.

    Aim for approximately 2 distinct marking points.

    [2]