Ohm’s Law Calculator
Use this tool to calculate relationships between current, voltage, resistance, and power in resistive circuits.
Enter two input values and click calculate to solve for the remaining values. Reset after each calculation for best results.
Ohm’s Law Explained
Ohm's Law explains the relationship between voltage, current, and resistance by stating that the current through a conductor between two points is directly proportional to the potential difference across the two points.
A law is relating the voltage difference between two points, the electric current flowing between them, and the resistance of the path of the current. Mathematically, the law states that V = IR, where V is the voltage difference, I is the current in amperes, and R is the resistance in ohms. For a given voltage, higher resistance entails lower current flow.