A galvanometer with its coil resistance 25 Ω requires a current of 1 mA for its full deflection. In order to construct an ammeter to read up to a current of 2 A the approximate value of the shunt resi

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A galvanometer with its coil resistance 25 Ω requires a current of 1 mA for its full deflection. In order to construct an ammeter to read up to a current of 2 A the approximate value of the shunt resistance should be:

TestHub · Accepted Answer

From the above figure, it is clear that, I g R g = ( I - I g ) S S ≃ 10 - 3 × 25 2 ⇒ S ≃ 12.5 × 10 - 3 ⇒ 1 .25 × 10 - 2 Ω

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