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Physics · May / June 2024 · Paper 11 · Question 13

5054Efficiency

The input power to a lamp is 6.0 W. The lamp wastes 2.7 J of energy in 3.0 s. What is the efficiency of the lamp?

  1. A0.15
  2. B0.45
  3. C0.55
  4. D0.85

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Correct answer: D. 0.85

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