Question
State the basic steps involved in the working of a heat engine.

Answer

1. The working substance absorbs heat $\left(Q_H\right)$ from a hot reservoir at constant temperature. $T_H$. It is an isothermal process $Q_H$ is positive.
2. Part of the heat absorbed by the working substance is converted into work ( $W$ ), i.e. mechanical energy. In this case, there is a change in the volume of the substance.
3. The remaining heat $\left(\left|Q_C\right|=\left|Q_H\right|-W\right)$ is transferred to a cold reservoir at constant temperature $T_C<T_H$. $Q_C$ is negative.

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