Question

The resistance of 1 A ammeter is $0.018\Omega$. To convert it into 10 A ammeter, the shunt resistance required will be

• A. $0.18\Omega$
• B. $0.0018\Omega$
• C. $0.002\Omega$
• D. $0.12\Omega$

Answer 1

The correct option is C $0.002\Omega$

By using $\frac{i}{i_g}=1+\frac{4}{S}\Rightarrow \frac{10}{1}=1+\frac{0.018}{S}\Rightarrow S=0.002\Omega$