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Cambridge IGCSE Combined Science practice

Paper 4 structured question: Energy, work and power

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4

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2

Marks

Topic

Energy, work and power

Exam-style question

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Paper 4Theory (Extended)2 marks

A student is investigating the efficiency of a light bulb.

Description

Light Bulb Efficiency

The light bulb consumes 60 J of electrical energy and produces 10 J of light energy.

  1. a

    Calculate the efficiency of the light bulb.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: Energy, work and power

Paper 4Theory (Extended)4 marks

Description

Factory Machine Energy Use

The machine has a total energy input of 500 J and produces 350 J of useful work.

  1. a

    Analyse the efficiency of the machine and discuss the implications of this efficiency.

    Aim for approximately 4 distinct marking points.

    [4]