Potentiometer method to verify
Connect the potentiometer as shown, close the key and record the potential difference by pressing the jockey at 10 cm intervals of length of the potentiometer wire. Repeat the experiment for six different lengths of potentiometer wire and record the corresponding pot. differences.
Find the ratio between potential difference and length. It is found.
V/l = constant (I) (where I is current and the current in series circuit is constant quantity) But l α R {By law of resistance} V/R = I or I = V/R Hence ohm’s law is verified.
