Question

A 1 mA meter d'Arsonaval movement with an internal resistance of $100\Omega$ is to be converted into a 0 - 100 mA ammeter. The value of shunt resistance required is ______ $\Omega$.

• A. 0.101
• B. 1.01
• C. 100
• D. 1.1

Answer 1

The correct option is B 1.01

$R_m=100\Omega$

$I_m=1mA$

$I=100mA$

$\therefore m=\frac{I}{I_m}=\frac{100mA}{1mA}=100$

$R_{sh}=\frac{R_m}{m-1}=\frac{100}{100-1}=1.01\Omega$