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Questions  >>  CBSE XII  >>  Physics  >>  Current Electricity
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Q)

A secondary cell after long use has an emt of $1.9\;V$ and a large internal resistance of $ 380 \Omega$ What maximum current can be drawn from the cell ?

$\begin{array}{1 1} 0.5\;A \\ 0.005\;A \\ 0.05\;A \\ 5\;A \end{array} $

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A)
Solution :
Given $E= 1.9 \;V$
Internal resistance of cell $r=380 \Omega$
When there is zero external resistance
$I_{max} =\large\frac{E}{r}$
$\quad= \large\frac{1.9}{380}$
$\quad= 0.005\;A$
Answer : $ 0.005\;A $
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