Question

An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm. To increase the range to 10 A the value of the required shunt is
A. `0.09 Omega`
B. `0.03 Omega`
C. `0.3 Omega`
D. `0.9 Omega`

Answer 1

Correct Answer - A
(a) `(i)/(i_(g)) = 1 + (G)/(S) implies (10)/(1) = 1 + (0.81)/(S) implies S = 0.09 Omega`