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CAIE A-Level Physics 5.1.3 Definition of Efficiency

Practise defining and calculating efficiency from useful output and total input energy or power, reporting fractions, decimals or percentages and identifying waste.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • define efficiency as useful energy output divided by total energy input
  • calculate efficiency from energy or power values and express the result as a fraction, decimal or percentage
  • compare useful output and wasted energy in a system while keeping the input and output quantities consistent

5.1.3—That the efficiency of a system is the ratio of useful energy output question 1

[Maximum number: 1]

Which statement about efficiency is correct?

A

Efficiency does not have a unit.

B

The joule is a unit of efficiency.

C

The metre is a unit of efficiency.

D

The watt is a unit of efficiency.

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