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  • A galvanometer coil has a resistance of 12 W and the metre shows full scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18 V?

27. A galvanometer coil has a resistance of 12 \Omega  and the metre shows full scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18 V? 

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The galvanometer can be converted into a voltmeter by connecting an appropriate resistor of resistance R in series with it.

At the full-scale deflection current(I) of 3 mA the voltmeter must measure a Voltage of 18 V.

The resistance of the galvanometer coil G =  12 \Omega 

I\times(R+G)=18 V

R=\frac{18}{3\times 10^{-3}}-12

R=6000-12

\\=5988\Omega

The galvanometer can be converted into a voltmeter by connecting a resistor of resistance 5988\Omega in series with it.

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