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Conversion of galvanometer into voltmeter
Concepts tested here
- Series resistance
All Questions
2010 AIPMT-PRE 1 question
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A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will beA galvanometer is converted into a voltmeter by connecting a high resistance R in series with it.
At full scale: $V = I_g(G + R)$
$R = \frac{V}{I_g} - G$
$R = \frac{30}{30\times10^{-3}} - 100 = 1000 - 100$
$R = 900\ \Omega$