Problem 9: How a 5 mA, 100 ohm galvanometer is converted into a 20 V voltmeter?
A galvanometer can be converted into a voltmeter by connecting a high resistance in series with the galvanometer.
Let the high resistance connected in series with the galvanometer is = Rh
Given data Galvanometer current = Ig = 5 mA Galvanometer resistance = Rg = 100 Ω
V = 20 V
Put the values