Ohm’s Law Calculator

The following calculator works out either voltage, current or resistance, given the other two parameters, using the equation:

\( V = IR \)
where:
\( V \) = voltage across the resistor
\( I \) = current through the resistor
\( R \) = resistance of the resistor

Variable: Value: Units: Calculate What? Variable Diagram:
\(V\) ohms-law-variable-diagram
\(I\)
\(R\)

Featured on the Resistors page.