Ohm's Law Calculator
Solve for voltage, current, resistance and power from any two values.
Your details
How the ohm's law calculator works
Ohm's law links voltage, current and resistance. Power follows directly from voltage times current.
Formula
V = I × R • P = V × I
Worked example
2 A through 6 Ω gives 12 V and 24 W of power.
Frequently asked questions
What is one ohm?
The resistance that lets exactly one ampere flow when one volt is applied.