How is a galvanometer converted into a voltmeter?

Explanation

The galvanometer can be converted into a voltmeter by connecting a high resistance in series with it.

The value of .R. to be connected series with galvanometer depends on the potential difference to be measured , `I underset(g)` is the current for which the galvanometer gives full scale deflection, & G the galvanometer resistance. In figure Potential difference across AB is `V=I underset(g)"(G+R)`