Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsThermodynamics2 Marks
Question
Define thermal efficiency of a heat engine.
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Answer
The thermal efficiency, $\eta$ of a heat engine is defined $W$ as $\eta=\frac{W}{Q_H}$, where $W$ is the work done (output) by $Q_H$ the working substance and $Q_H$ is the amount of heat absorbed (input) by it. [Note : $\eta$ has no unit and dimensions or its dimensions are $\left[ M ^{\circ} L ^{\circ} T ^{\circ}\right]$.]
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