When we convert a galvanometer to voltmeter it is said that we should connect infinite resistance with galvanometer. But if the resistance wil be infinity then there will be no current in galvanometer. And without current magnetic force will not work in galvanometer. And if magnetic force don’t work then there will be no deflection in needle. Then how we measure the voltage????

and 1 more problem is that the equation-> V=i(G+R) [where i=current in voltmeter branch and G=Resistance of coil of galvanometer and R=infinity]

then V = 0 x infinity.

now 0 x infinity =???????????

Destro Breakerz , 6 Years ago

Grade 12