Question

What are limitations of ohms law?

Answer 1

Ohm's law states that if the physical properties of a conductor remains unaltered,the current flowing through it is directly proportional to the voltage difference.

So,clearly on increasing the temperature(temperature is a physical property) Ohm's law will not be valid.

We know the relation of resistance and increase in temperature as `R_t =R_o(1+alpha×t)` (where, `R_t` is the resistance at temperature `t` `R_o` is the resistance at temperature zero and `alpha` is a constant)

Again,Ohm's law is given for conductors,so in case of semiconductors Ohm's law will not be applicable.

It's also not applicable for gases and electrolytes.