Explain, what do you understand by the efficiency of a heat engin… - Vidyadip

Question

Explain, what do you understand by the efficiency of a heat engine?

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Answer

The efficiency of a heat engine is stated as the ratio of the net work done by the heat engine and heat absorbed by the working substance. Suppose a heat engine absorbs Q₁ heat from the hot reservoir and gives Q₂ heat rejected to the colder reservoir. So, the work done by the working substance is,
W = Q₁ - Q₂
So effieciency of heat engine,
$\eta=\frac{\text{W}}{\text{Q}_1}=\frac{\text{Q}_1-\text{Q}_2}{\text{Q}_1}=1-\frac{\text{Q}_2}{\text{Q}_2}$

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