First slide

Electrical measuring instruments

Question

A galvanometer whose resistance is 100 ohm has 25 divisions in it . When a current of $4 \times 10^{- 4} A$ passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5 V, it should be connected to a resistance of

Moderate

Solution

$Full deflection current in galvanometer , I_{g} = 4 \times 10^{- 4} \times {25=10}^{-2} A T o w o r k a s V o l t m e t e r V = i_{g} (G + R) \Rightarrow 2.5 = (100 + R) 10^{- 2} \Rightarrow R = 150 Ω$

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