What are limitations of ohms law?

1 Answer
Feb 22, 2018

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.