Question

can anyone please please explain me the experiment of Ohm's Law which is done by using four cells one after another.​

Answer 1

Ohm's law is basically not a fundamental law which means it has exceptions.Ohm's law is an empirical law which means it is stated based on some observations.Though it works most of the time there are indeed cases where ohm's law do not satisfactorily explain certain phenomena.

One example is an incandescent light bulb. The tungsten filament in the bulb does not follow Ohm's law.