A cell of emf $E$ is connected across an external resistance $R$. W...

Question

A cell of emf $E$ is connected across an external resistance $R$. When current $I$ is drawn from the cell, the potential difference across the electrodes drops to $V$. Write the expression for the internal resistance $r$ of the cell.

Accepted Answer

Using terminal voltage equation $V = E - Ir$, rearranging: $$r = \frac{E - V}{I}$$

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