The full-scale deflection for a galvanometer is 10 mA. Its resistance is 100 Ω. How can it be converted into an ammeter of range 100 A? (Answer: Rₛ = 0.010) 



Given:

Current through the galvanometer = Ig = 10 mA = 10 ｘ 10⁻³ A

Resistance  = Rg = 100 Ω

Maximum Current range = I = 100 A


To Find:

Shunt Resistance = Rs = ?


Solution:

The formula for shunt Resistant Rs is


Rs = IgRgI-Ig

by putting the corresponding values


Rs = 10ｘ10⁻³Aｘ100Ω100A-10ｘ10⁻³A


Rs = 1ΩA99.99A


Rs = 0.01 Ω ---------------------Ans. 




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