Ohm's law

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 a 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.


1.      It can not be applied to the circuits containing transistors.

2.      It is not applicable for the circuits containing non linear such as   electric arc and powdered carbon etc.

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