I = V/R
where I is the current through the conductor in units of amperes, V is the voltage measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms.

From Ohm’s Law,

I α V

Or I = K.V where constant of proportionality
K is known as conductance of a conductor whose unit is Mho. As conductance is
reciprocal of resistance we can write conductance = 1/resistance

i.e. K = 1/R

therefore, From Ohm’s Law we
can write I = V.1/R = V/R

or V= IR

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