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Physics · May / June 2022 · Paper 12 · Question 15

5054Efficiency

The electrical energy supplied to a kettle is 600 kJ. Of this energy, 45 kJ is transferred to the surroundings and 15 kJ is used to heat the casing of the kettle. The remaining energy is used to heat the water. What is the efficiency of the kettle?

  1. A0.10
  2. B0.90
  3. C0.925
  4. D0.975

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Correct answer: B. 0.90

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