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Wheatstone Bridge

How is a galv...

Question

How is a galvanometer converted into a volmeter and an ammeter? Draw the relevant diagrams and find the resistance of the arrangement in each case.
Take resistance of galvanometer as $G$ .

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Solution

A galvanometer is converted into a voltmeter by connecting a high resistance $^{'} R^{'}$ in series with it.
A galvanometer is converted into ammeter by connecting a small resistance (called shunt) in parallel with it.
Resistance of voltmeter, $R_{v} = G + R$
Resistance of Ammeter, $R_{A} = \frac{G r_{s}}{G + r_{s}}$

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