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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Energy, work and power

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Energy, work and power

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Paper 3Theory (Core)4 marks

Comparing energy efficiency in vehicles.

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Energy Efficiency in Vehicles

Two vehicles are compared: Vehicle A has an efficiency of 75% and Vehicle B has an efficiency of 60%.

  1. a

    Compare Discuss the implications of the efficiency differences between the two vehicles.

    Aim for approximately 4 distinct marking points.

    [4]

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Paper 3 structured question: Energy, work and power

Paper 3Theory (Core)2 marks

Description

Energy Transfer in Appliances

Consider an electric kettle that uses 2000 J of energy to heat water. If it successfully heats the water to the desired temperature, the useful energy output is 1800 J.

  1. a

    Analyse Calculate the efficiency of the kettle.

    Aim for approximately 2 distinct marking points.

    [2]