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Q. To draw maximum current from a combination of cells, how should the cells be grouped?

BHUBHU 2007

Solution:

Current taken from the combination of $n$ cells each of internal resistance $r$ in series with external resistance $R$ is
$i=\frac{n E}{n r+R}$
Similarly, for parallel combination
$i=\frac{n E}{r+n R}$
For mixed grouping of $n$ such cells in $m$ rows with external resistance $R$ is
$i=\frac{m n E}{m R+n r}$
It is obvious that maximum current obtained from each combination depends on relative values of external and internal resistance.