Exam-style question
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How do you calculate the efficiency of a heat engine?.
- A.Efficiency = (Useful work output / Total energy input) x 100
- B.Efficiency = (Total energy input / Useful work output) x 100
- C.Efficiency = (Useful work output + Total energy input) x 100
- D.Efficiency = (Total energy input - Useful work output) x 100
Model answer
What a good answer should say
- Efficiency = (Useful work output / Total energy input) x 100
Explanation
Why this works
This formula correctly defines how to calculate the efficiency of a heat engine, measuring the ratio of useful work output to total energy input.
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