Ohm’s law explains the relationship between voltage and current in resistors.

The statement says: The current flowing through any resistor is directly proportional to the voltage applied across its ends.

Mathematically Ohm’s Law is given by:

V = IR … (1)


V = Voltage

I = Current

R = Resistance


Ohm’s Law is widely used in Electrical Engineering for solving circuits. A circuit is the combination of voltage source and resistors forming a closed loop (Like the one shown above).

The Ohm’s law statement is experimentally derived statement. George performed various experiments on 1k ohm resistor and finally published the treatise in 1827.


Equation 1 can be expressed in physics as the equation:

J = σE

where J is the current density, E is the electric field and sigma is conductivity.