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  • 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-Option: 1

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-

Option: 1

0.001


Option: 2

0.01


Option: 3

1


Option: 4

0.05


Answers (1)

Galvanometer is converted into ammeter, by connected a shunt, in parallel with it

\frac{G s}{G+s}=\frac{V_G}{I}=\frac{25 \times 10^{-3}}{25}=0.001 \Omega

Here s<<<G  So, s=0.001\Omega

In order to increase the range of ammeter n times, the value of shunt resistance to be connected in parallel to galvanometer is

S=\frac{G}{n-1}

Posted by

Ramraj Saini

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