The maximum power dissipated in an external resistance $R$, when connected to a cell of emf $E$ and

Question

The maximum power dissipated in an external resistance $R$, when connected to a cell of emf $E$ and internal resistance $r$ will be

Professor PC Thomas Classes · Answer

Maximum power is dissipated when $R = r$. Power $P = \frac{E^2}{4r}$.