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Physics · Oct / Nov 2024 · Paper 12 · Question 11

5054Efficiency

Which equation is used to calculate the efficiency of an energy transfer?

  1. Aefficiency = useful energy output / total energy input
  2. Befficiency = total energy input / useful energy output
  3. Cefficiency = total energy output / total power input
  4. Defficiency = (useful energy output) × (total energy input)

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Correct answer: A. efficiency = useful energy output / total energy input

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