- Ohm’s law is valid for metal conductors provided the temperature and other physical conditions remain constant.
- The resistance of the material changes with temperature. Hence for changing temperature the V-I graph for a conductor will be non-linear.
- Ohm’s law is not applicable to gaseous conductors.
- It is also not applicable to semiconductors such as germanium and silicon
Also Read: Ohm’s Law | Ohmic conductor and nonohmic conductor