Physics | VITEEE 2017 | Discussion Page

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

A) 0.001

B) 0.01

C) 1

D) 0.05

Option A

A galvanometer is converted into an ammeter, by connected a shunt, in parallel with it.

$\frac{GS}{G+S}=\frac{V_{G}}{I}=\frac{25\times10^{-3}}{25}$

$\frac{GS}{G+S}=0.001$ Ω

Here S<<G so S = 0.001 Ω

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