O-LevelPhysicsEnergy & Work5054/12 · May/June 2022 · Q151 Mark

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?

A0.10

B0.90

C0.925

D0.975

✓ Correct answer

B: 0.90

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Topic: Energy & Work, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2022 Paper 1 Variant 2, question 15.

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