The full scale deflection current of an ammeter is 1mA and its internal resistance is $100\Omega$. If this meter is to have full deflection of 5A, what is the value of the shunt resistance to be used?
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To quickly calculate ammeter shunts, remember that the shunt resistance must always be much smaller than the meter resistance.
Using the relation \( I_m R_m = I_{sh} R_{sh} \) directly can also prevent algebraic mistakes.
Since the current division is extremely high, the shunt resistance is approximately \( \frac{R_m}{m} \).