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Physics (AS & A Level) · May / June 2020 · Paper 11 · Question 19

9702Energy conservation

Power is transferred through a machine as shown. What is the efficiency of the machine?

  1. A\frac{P_I}{P_O + P_L}
  2. B\frac{P_L}{P_I}
  3. C\frac{P_L}{P_O}
  4. D\frac{P_O}{P_I}

As printed in the paper

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Correct answer: D. \frac{P_O}{P_I}

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