First slide

Moving coil Galvanometer

Question

A voltmeter of resistance $1000 Ω$ gives full scale deflection when a current of 100 mA flows through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at fulI scale deflection, is

Easy

A

$1000 Ω$
B

$9000 Ω$
C

$222 Ω$
D

$111 Ω$

Solution

$\begin{array}{l} By using \frac{i}{i_{g}} = 1 + \frac{G}{S} \\ \Rightarrow \frac{1}{100 \times 10^{- 3}} = 1 + \frac{1000}{S} \Rightarrow S = \frac{1000}{9} = 111 Ω \end{array}$

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