Exam-style question
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In a heat engine, what does the term 'efficiency' refer to?.
- A.The ratio of useful work output to total energy input
- B.The amount of heat wasted during the cycle
- C.The speed of the engine operation
- D.The temperature difference between the heat source and sink
Model answer
What a good answer should say
- The ratio of useful work output to total energy input
Explanation
Why this works
Efficiency in a heat engine is defined as the ratio of the useful work output to the total energy input, indicating how effectively the engine converts heat energy into work.
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