Experimental Verification Of Ohm’s Law

The connection diagram for verification of Ohm’s law is shown in.

A conductor of resistance R ohms is connected in series with an ammeter A, rheostat (variable resistance) and a battery B through key K. Voltmeter V is connected across the ends of the resistance to measure the potential difference across it.

Now key K is pressed and redings of voltmeter and ammeter are noted. After relapsing the key K the setting of the rheostat is changed, Key K is again pressed and voltmeter and ammeter readings are noted. Thus for various settings of rheostat the reading of voltmeter and ammeter are recorded. Form the observations it will be found that the ratio of voltmeter reading and ammeter reading remains the same i.e.

V₁  =  V₂  = V₃  = V₄.......... = Constant = R, the resistance of the conductor.
I₁        I₂       I₃      I<sub>4

                          
                       Verification of Ohm's Law</sub>


If a curve be drawn between voltmeter reading and ammeter reading, a straight line passing through origin O will be obtained and the resistance of the conductor will be given by the slope of this line.

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