Question

An ammeter reads upto 1 ampere. its internal resistance is 0.81 omh. to increase the range to 10 ampere, the value of the required shunt is

Answer 1

   

Answer.

A galvanometer can be converted into an ammeter by connecting a low resistance, called shunt, in parallel to the galvanometer.

Shunt required is given by

S = igG/(i−ig)

ig = 1A
I = 10 A
G = 0.81 ohm

S = 1 x 0.81/(10−1)
    = 0.81/9 = 0.09 ohm