A galvanometer can be used as a voltmeter by connecting a
AIPMT 2004,AIPMT 2002, Easy
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A galvanometer has its own resistance low but a voltmeter must have high resistance. $A$ voltmeter indeed is a modified form of a pivoted coil galvanometer. since the resistance of coil of galvanometer of its own is low, its resistance is to be increased as is a necessary condition for a voltmeter. For this an appropriate high resistance should be connected in series with the galvanometer as shown.
Note$:$The resistance of an ideal voltmeter should be infinite.
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