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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Electrical safety

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Electrical safety

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Paper 3Theory (Core)3 marks

The relationship between electric current and heat generation is important in electrical engineering.

Description

Joule's Law

Joule's law states that the heat produced in a conductor is proportional to the square of the current, the resistance, and the time the current flows.

  1. a

    Calculate the heat produced in a conductor with a resistance of 5 ohms when a current of 2 amperes flows for 10 seconds.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Electrical safety

Paper 3Theory (Core)3 marks

Description

Heat Generation in Conductors

When electric current flows through a conductor, it encounters resistance, which generates heat. This phenomenon is described by Joule's law.

  1. a

    Explain how electric current generates heat in a conductor.

    Aim for approximately 3 distinct marking points.

    [3]