Question

in which case ohm's lows in not applications?​

Answer 1

Answer:

All ac circuits and conductors obey Ohm's law suggesting current flowing through them is directly proportional to the voltage applied.

But semiconductors do not obey Ohm's law because I-V characteristics is a curved line instead of straight line.

Answer 2

Answer:

Ohm's law is not applicable in case of insulators.

or all non ohmic instruments.