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How is a galvanometer converted into a v...

How is a galvanometer converted into a voltmeter?

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To convert a galvanometer into a voltmeter, a high resistance is connected in series with the coil. The galvanometer with this modification is called a voltmeter. The value of the high resistance R to be connected in series with the coil depends on the maximum potential difference to be measured. If `I_(g)` be the current for a full scale deflection then,
`" "V=I_(g)(G+R)`
G is the resistance of the galvanometer.
`therefore " "R=V/I_(g)-G`
`" "I_(g) propto V`
Since G and R are constants, the scale can be graduated to read potential differences directly. A voltmeter is used for measurement of potential difference. It should be connected in parallel in a circuit.
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