Exam-style question
Try this first
Which of the following best describes the energy transfer in a heat engine?.
- A.Heat energy is converted entirely to mechanical work
- B.Heat energy is converted to work with some losses
- C.Mechanical work is converted to heat energy
- D.No energy is transferred in a heat engine
Model answer
What a good answer should say
- Heat energy is converted to work with some losses
Explanation
Why this works
In a heat engine, heat energy is converted into mechanical work, but due to inefficiencies, some energy is lost as waste heat, preventing 100% conversion.
Common mistake
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