Question

How is a galvanometer converted into a voltmeter and an ammeter? Draw the relevant diagrams and find the resistance of the arrangement in each case. Take resistance of galvanometer as G.

Answer 1

A galvanometer is converted into a voltmeter by connecting a high resistance ‘R’ in series with it.

A galvanometer is converted into an ammeter by connecting a small resistance (called shunt) in parallel with it.

Resistance of voltmeter, R_V = G + R

Resistance of Ammeter, \(R_A=\frac{Gr_s}{G+r_s}\)