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. $0.03\, O$
• B. $0.3\, O$
• C. $0.9\, O$
• D. $0.09\, O$

Answer 1

Answer: (D)

$0.09\, O$

Answer 2

$S=\frac{I_{g}G}{I-I_{g}}=\frac{1\times0.81}{10-1}=0.09\, O$