Ohm’s law was given by experimenting and making graph of V vs. I that is V on y axis and I on X axis and by the observations Ohm deduced that V/I is coming out to be nearly constant, and as we increase V(potential difference) I(current) increases simultaneously and linearly that is current I increases linearly with potential difference V.

He told that V/I is a constant and is named as resistance(R).

Now we know that V/I is constant, so let’s calculate the ratio.

When the potential difference is 0.5 V then the value of current comes out to be 0.2 A , and when the potential difference is 1 V the value of the current comes out to be 0.4 V.

Hence the Ohm’s law is also verified that is,