Question

A galvanometer of resistance G can be converted into a voltmeter of range (0-V) volts by connecting a resistance R in series with it. How much resistance will be required to change it from (0-V/2)?

Answer 1

Dear Student,

A galvanometer can be converted to voltmeter by connecting high resistance in series. It is given that for voltmeter of range V, galvanometer resistance is G and resistance connected is R.

So to for voltmeter for range v/2 , the required resistance r is calculated by formula,

V= I_g (G+R)
v/2=I_g(G+r)
r =v/2I_g -G.

Regards.