Question

A
moving Coil instrument gives full scale
deflection of 24 mA, when potential difference
across 72 m ohm's. Calculate shunt resistance
for full scale deflection of 120 A​

Answer 1

Answer:

We can extend the range of ammeter by keeping a shunt resistance.

Here Rm = internal resistance of the coil

Rsh = Shunt resistance

I = Required full-scale range

Im = Full scale deflection of current

As the two resistances, Rm and Rsh are in parallel, the voltage drop across the resistance is equal.

Explanation:

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