Ohm Law | Experimental verification of Ohm law

Ohm law describes relationship between voltage and current applied across any conductor. Ohm law states: The current flowing through a conductor is directly proportional to Voltage (potential difference), keeping the Resistance constant.
Mathematically

V∝I

Where 'R', is constant of proportionality in above expression. Removing proportionality the equations transforms to:

V=IR

Experimental Verification

Take a Resistor and connect a variable Voltage source across resistor. Join ammeter in series with resistor for measuring current.

Switch on the voltage source. Initially start with zero and measure amount of Current. On that point no current is flowing, remember that Current needs potential difference to flow.

Now increase the Voltage to 1 V, Ammeter will deflect and point to 1 A current.

Increase the Voltage to 2 V, Keep on doing so and current will increase with increase in Voltage.

Reverse of this also exists, decreasing Voltage from peak value to zero, cause current to reduce and in end it falls zero on 0 V.