An ammeter reads upto $1\, ampere$. Its internal resistance is $0.81\, ohm$. To increase the range to $10\, A$ the value of the required shunt is ............ $\Omega $
AIEEE 2003, Medium
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$\frac{i}{{{i_g}}} = 1 + \frac{G}{S}$
$ \Rightarrow $ $\frac{{10}}{1} = 1 + \frac{{0.81}}{S}$
$ \Rightarrow S = 0.09\,\Omega $.
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