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}Experimental Verification of Ohm\’s Law: To verify Ohm\’s law, take a resistor R, connect voltmeter across it. Connect an ammeter, battery, key and rheostat to it as shown in Fig. Put in the key K. Read the value of potential difference across resistor R with the help of voltmeter and the current flowing through resistor with the help of ammeter. Note the readings. Vary the current in the circuit by sliding rheostat and go on noting reading in voltmeter and ammeter. Plot a graph between V and I on graph paper. It will come out to be straight line as shown in fig.