O-LevelPhysicsEnergy & Work5054/12 · Oct/Nov 2025 · Q171 Mark
What is the definition of efficiency?
Aefficiency = useful energy input / total energy output
Befficiency = total energy input / total energy output
Cefficiency = useful energy output / total energy input
Defficiency = total energy output / total energy input
✓ Correct answer
C: efficiency = useful energy output / total energy input
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