Question

A certain galvanometer has a resistance of 400 W and deflects full scale for a current of 0.2 mA through it. The shunt resistance required to convert it into 3A ammeter is-

• A. 0.0135 W
• B. 0.027 W
• C. 0.0405 W
• D. 0.054 W

Answer 1

Answer: (B)

0.027 W

Answer 2

Use S = $\frac { \mathrm { I } _ { \mathrm { g } } \mathrm { R } _ { \mathrm { g } } } { \mathrm { I } - \mathrm { I } _ { \mathrm { g } } }$