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Physics (AS & A Level) · May / June 2025 · Paper 12 · Question 20

9702Energy conservation

Which expression gives the efficiency of a system?

  1. Atotal energy input / useful energy output
  2. B(useful energy output + wasted energy output) / total energy input
  3. Cuseful energy output / total energy input
  4. Dwasted energy output / total energy input

As printed in the paper

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Correct answer: C. useful energy output / total energy input

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