Question

What is ohm law and its limitations..

Answer 1

ohm's law-under similar conditions of temperature and pressure the potential difference and current flowing in conductor are directly proportional to each other
V=IR

Answer 2

Ohm's law state that the potential difference (voltage) across the ideal conductor is proportional to the current through it.
V=IR
where, V = potential difference between two points which include a resistance, I =current flowing through the resistance and R=resistance (constant of proportionality ).

Limitations of Ohm's law :
1. If temperature changes, ohm's law cannot be applicable.
2. Not applicable for non - metallic conductors.
3. Not applicable for non linear devices ( diodes, zener diodes, etc.,).