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# A generator develops am e.m.f of $120\;v$ and has a terminal potential difference of $115\;v$ when the as mature current is $25\;A$ What is the resistance of the as mature ?

$\begin{array}{1 1} 0.2 \; \Omega \\ 2 \;\Omega \\ 20\;\Omega \\ 0.02\; \Omega \end{array}$

given $E= 120\;v$
$v= 115\;v$
$I= 25\;A$
$I= \large\frac{E-v}{R}$
$R= \large\frac{E-v}{I}$
$\quad= \large\frac{120- 115}{25}$
$\qquad= \large\frac{5}{25}$
$\qquad= 0.2 \Omega$
Answer : $0.2 \; \Omega$