Voltmeter - Practice Questions & MCQ

Voltmeter

It is a device used to measure Potential difference and is always put in parallel with the circuit element whose voltage is to be measured

Convert the galvanometer into a voltmeter by connecting a large series of resistances. 

• The equivalent resistance of the combination is $G+R$
• The required value of high resistance to be connected in series with the galvanometer is

$$
R=\frac{V}{I_g}-G=\left[\frac{V}{V_g}-1\right] G
$$

 V is the total voltage applied across the circuit and $V_g$ is the total voltage drop across the galvanometer.

• If $n^{\text {th }}$ part of the applied voltage across galvanometer, that is $V_g=V / n$, then $R=(n-1) G$.