A-LevelPhysicsWork, energy and power9702/12 · May/June 2025 · Q201 Mark
Which expression gives the efficiency of a system?
Atotal energy input / useful energy output
Buseful energy output + wasted energy output / total energy input
Cuseful energy output / total energy input
Dwasted energy output / total energy input
✓ Correct answer
C: useful energy output / total energy input
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