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  4. A milli voltmeter of 25 milli-volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be

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Q. A milli voltmeter of $25$ milli-volt range is to be converted into an ammeter of $25$ ampere range. The value (in ohm) of necessary shunt will be

NTA AbhyasNTA Abhyas 2022

Solution:

Voltage range of given milli voltmeter is $V=25\,mV$ .
This milli voltmeter is to be converted into an ammeter of range $25A$ ,
So $I=25A$ .
If the required shunt is $R$ then we can use ohm's law $V=IR$ .
Hence $R=\frac{V}{I}$
$\Rightarrow R=\frac{25 mV}{25 A}$
$\Rightarrow V=\frac{25 \times 10^{- 3}}{25}=10^{- 3}=0.001\,ohm$