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Physics (AS & A Level) · May / June 2022 · Paper 13 · Question 17

9702Energy conservation

What is meant by the efficiency of a system?

  1. Athe difference between the useful energy output from the system and the total energy input
  2. Bthe difference between the useful energy output from the system and the wasted energy output
  3. Cthe ratio of the useful energy output from the system to the total energy input
  4. Dthe ratio of the useful energy output from the system to the wasted energy output

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Correct answer: C. the ratio of the useful energy output from the system to the total energy input

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