Ohm\’s law states that the current passing through a conductor is directly proportional to the potential difference across its ends provided the temperature and other physical conditions remains unchanged.or I µ V or V µ I or V = RIwhere R is a constant called resistance. Resistance is the property of a body to oppose the flow of current. R the resistance depends upon the nature of the conductor, its temperature and its dimensions (length, area)R = {tex}\\frac VI{/tex}or I =\xa0{tex}\\frac VR{/tex} i.e. I α V and I α {tex}\\frac 1R{/tex}