Question

A galvanometer of resistance $ 15\Omega$ gives full scale deflection for a current of $2\, mA$. Calculate the shunt resistance needed to convert it into an ammeter of range $5\,A$

• A. $ 0.178\,\Omega $
• B. $ 0.002\,\Omega $
• C. $ 0.006\,\Omega $
• D. $ 5\,\Omega $

Answer 1

Answer: (C)

Resistance of shunt needed to convert it into ammeter is
$S =\frac{I_{g} G}{I-I_{g}} $
$=\frac{2 \times 10^{-3} \times 15}{5-2 \times 10^{-3}}=0.006\, \Omega$