Question

An ammeter, whose resistance is $ 50\,\Omega $ can read upto $10 \,mA$. In order to increases its range to $1\, A$. What should be the shunt resistance?

• A. $0.5050 \, \Omega $
• B. $5.050 \, \Omega $
• C. $50.50 \, \Omega $
• D. $505.05 \, \Omega $

Answer 1

Answer: (A)

To increase the range of ammeter a suitable resistance (shunt) should be connected in parallel.
Let resistance of shunt wire $=S $
$S=\frac{i_{g} \times G}{i-i_{g}} $
$S=\frac{10 \times 10^{-3} \times 50}{1-\left(10 \times 10^{-3}\right)}$
$=0.5050 \,\Omega$