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  4. To get the maximum current from a parallel combination of n identical cells each of internal resistance r in an external resistance R, when

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Q. To get the maximum current from a parallel combination of $n$ identical cells each of internal resistance $r$ in an external resistance $R$, when

COMEDKCOMEDK 2004Current Electricity

Solution:

we know that internal resistance when cell are parallel $r _{ eq }=\frac{ r }{ n }$
$I \propto \frac{1}{ r }$
Cells are joined in parallel when internal resistance is higher then a external resistance. $( R << r )$
$i =\frac{ E }{ R +\frac{ r }{ n }}$