Question

A galvanometer of resistance $100\Omega$ gives full scale deflection with 0.01 A current. How much resistance should be connected in parallel to convert it into an ammeter of range 10 A?

• A. $0.100\Omega$
• B. $1.00\Omega$
• C. $10.00\Omega$
• D. $100.00\Omega$

Answer 1

The correct option is A $0.100\Omega$

Shunt resistance is given by,
$S=\frac{I_g\times R_g}{I-I_g}=\frac{0.01\times 100}{10-0.01}$
$=\frac{0.01\times 100}{9.99}=0.100\Omega$