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Cambridge IGCSE Combined Science practice

What does a high efficiency in energy transfer indicate?

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Show answerEnergy, work and power revisionRevise the key idea

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MCQ

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cambridge_mcq

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Topic

Energy, work and power

Exam-style question

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What does a high efficiency in energy transfer indicate?.

  1. A.More energy is wasted
  2. B.Less energy is wasted
  3. C.Energy is not transferred
  4. D.Energy is lost as sound

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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]