An electric energy source has internal resistance $r$ and is connected in a circuit having resistanc

Question

An electric energy source has internal resistance $r$ and is connected in a circuit having resistance $R$. The voltage across the terminals of the source is $50 \%$ of the electromotive force. Then\

Professor PC Thomas Classes · Answer

$V=\frac{E R}{R+r}$ Given $V=\frac{E}{2}$\ $\frac{E}{2}=\frac{E R}{R+r}$\ Solve.\