A galvanometer gives full scale reading of $50\ mA$ , when a $p.d.$ , across its terminals is $0.15\ V$ . It can be used as an ammeter of range $0 - 100\ A$ by connecting a shunt resistance of
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$G=\frac{0.15}{5 \times 10^{-2}}=3\, \Omega$
$\mathrm{i}_{\mathrm{g}} \mathrm{G}=\left(\mathrm{i}-\mathrm{i}_{\mathrm{g}}\right) \mathrm{R}_{\mathrm{S}}$
$50 \times 10^{-3} \mathrm{r}^{3}=(1-0.05) \times \mathrm{R}$
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