Question

A cell of emf ${}^{\prime }{E}^{\prime }$ and internal resistance ${}^{\prime }{r}^{\prime }$ draws a current ${}^{\prime }{I}^{\prime }$. Write the relation between terminal voltage ${}^{\prime }{V}^{\prime }$ in terms of $E$, $I$ and $r$.

Answer 1

V = $Ir$

E = terminal voltage + internal voltage drop

E = V + v

E - v = V

E - $Ir$ = terminal voltage drop or V