A galvanometer G deflects full scale when a p | vedclass

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(A) To construct an ammeter from a galvanometer,a shunt resistance $R_S$ is connected in parallel with the galvanometer.The full-scale deflection curr

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$0.25$

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(A) To construct an ammeter from a galvanometer,a shunt resistance $R_S$ is connected in parallel with the galvanometer.The full-scale deflection current of the galvanometer $I_g$ is given by $I_g = V / r_g = 0.50 \ V / 25 \ \Omega = 0.02 \ A$.The total current $I$ to be measured is $2.0 \ A$. The current through the shunt resistance $I_S$ is $I_S = I - I_g = 2.0 \ A - 0.02 \ A = 1.98 \ A$.Since the galvanometer and shunt are in parallel,the potential difference across them is the same: $V = I_g \cdot r_g = I_S \cdot R_S$.Therefore,$R_S = (I_g \cdot r_g) / I_S = 0.50 \ V / 1.98 \ A \approx 0.2525 \ \Omega$.The value closest to this is $0.25 \ \Omega$.

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