Ohm's law calculator

How it works?

Ohm's law is an empirical law that applies to linear resistive elements. It states that the current through the resistor is directly proportional to the voltage across its terminals, the proportionality constant being the resistance itself.

The electric current \(\mathbf{I}\) is expressed in units of ampere \(\mathbf{[A]}\) in the International System of Units (SI).
The voltage \(\mathbf{U}\) is expressed in units of volt \(\mathbf{[V]}\) in the International System of Units (SI).
The electrical resistance \(\mathbf{R}\) is expressed in units of ohm \(\mathbf{[\Omega]}\) in the International System of Units (SI).

The linear dependence between the three scalar quantities can be expressed using the following equations:
$$ I = \frac{U}{R} $$ $$ U = IR $$ $$ R = \frac{U}{I} $$