A-LevelPhysicsWork, energy and power9702/12 · Oct/Nov 2021 · Q181 Mark

The energy conversions inside a power station burning fossil fuel can be simplified as shown. chemical energy W → thermal energy X → electrical energy Y Which expression gives the efficiency of the power station?

AY / W

BY / (W + X)

CY / X

DY / (W + X + Y)

✓ Correct answer

A: Y / W

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Topic: Work, energy and power, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2021 Paper 1 Variant 2, question 18.

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