First slide

Electrical measuring instruments

Question

A galvanometer having a coil resistance 100 $Ω$ gives a full scale deflection when a current of 1 mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of 10V?

Easy

A

9.9 k $Ω$
B

7.9 k $Ω$
C

8.9 k $Ω$
D

10 k $Ω$

Solution

$V = i_{g} (R_{g} + R) \Rightarrow 10 = 10^{- 3} (100 + R) \Rightarrow R = 9900 Ω = 9.9 k Ω$

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