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A galvanometer having a coil of resistan...

A galvanometer having a coil of resistance 12 `Ω` gives full scale deflection for a current of 4 mA. How can it be converted into a voltmeter of range 0 to 24V.

Text Solution

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`G= 12 omega I_(g) =4A ,V =24 V`
`R=(I)/(I_(g))-G`
=6000-12
=5988
R=5988 `omega` By connecting this high resistance in series with the galvanometer we can convert galvanometer into a voltmeter.
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