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  4. An ammeter whose resistance is 180 Ω gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is :-

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Q. An ammeter whose resistance is $180\, \Omega$ gives full scale deflection when current is $2\, mA$. The shunt required to convert it into an ammeter reading $20\, mA$ (in ohms) is :-

Solution:

$\left( I - I _{ g }\right) s = I _{ g } \,R _{ g }$
$S =\frac{180 \times 2 mA }{(20 mA -2 mA )} $
$=20\, \Omega$