O-LevelPhysicsEnergy & Work5054/11 · May/June 2013 · Q121 Mark

The diagram shows the energy transfer through a machine. The machine is 50% efficient. Which equation is correct?

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Ainput energy = useful output energy

Buseful output energy = input energy + wasted energy

Cwasted energy = input energy + useful output energy

Dwasted energy = useful output energy

✓ Correct answer

D: wasted energy = useful output energy

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Topic: Energy & Work, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2013 Paper 1 Variant 1, question 12.

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