Question

Explain with a circuit diagram, how to convert a galvanometer into a voltmeter.

Answer 1

The galvanometer can be converted into a voltmeter by connecting a high resistance in series with it.
The value of ${}^{\prime }{R}^{\prime }$ to be connected in series with the galvanometer depends on the potential difference to be measured, $I_g$ is the current for which the galvanometer gives full scale deflection, and $B$ the galvanometer across $AB$ is
$V=I_g(G+R)$
$R=\frac{V}{I_g}-G$.