Let be the resistance of galvanometer and be the current with which galvanometer gives full RG Ig scale deflection. To measure a maximum potential difference a high resistance is connected in V, R series with it. Total resistance of the device = R + RG Therefore by law Ohm’s V V I g(R or R RG I g R I g
Let RG be the resistance of galvanometer and Ig be the current with which galvanometer gives full scale deflection. To measure a maximum potential difference V, a high resistance R is connected in series with it. Total resistance of the device = R + RG or R V RG I g Therefore by Ohm’s law V I g(R R I g
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