The current flowing through a conductor is directly proportional to the potential difference across the ends of the conductor and inversely proportional to its resistance.
If V is the potential difference across the ends of a conductor, R is its resistance and I is the current passing through it then as per the Ohm’s law
I α V/R
or I = V/R
or V = IR
Where I is the current in Amperes, V potential difference is volts and R is the resistance of the conductor in ohms.
- It can not be applied to the circuits containing transistors.
- It is not applicable for the circuits containing non linear such as electric arc and powdered carbon etc.