Question

Under what conditions is Ohm's law applicable?

Answer 1

• According to Ohm's law, the electric current flowing through a conductor is directly proportional to the potential difference across its ends.
• The formula for Ohm's law is given as: $V=IR$

where $V$is the voltage, $I$ is current, and $R$is resistance.

• For this proportionality to be valid, the values of resistance must remain constant. Since the resistance of a metal varies with the temperature, the temperature must be constant.
• Hence, Ohm's law is applicable for metals under constant temperature.