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Efficiency: O Level Physics MCQ App Download & e-Book - 423

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MCQ: 423

Efficiency of a machine is measured by

  1. (Wasted Energy Output ⁄ Energy Input) × 100 %
  2. (Energy Input ⁄ Wasted Energy Output) × 100 %
  3. (Useful Energy Output ⁄ Energy Input) × 100 %
  4. (Energy Input ⁄ Useful Energy Output) × 100 %
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