Ohm's Law Calculator
Voltage, current, resistance and power from any two values.
A
Ω
Voltage
20V
Power
40W
ShowHide the working
- 1V = I × R = 2 × 10 = 20 V
Formula
V = I × R, P = V × IHow it works
Ohm's law relates voltage, current and resistance. Give any two and the third — plus the power — follows.
Example
2 A through 10 Ω needs 20 V and dissipates 40 W.
About the Ohm's Law Calculator
Voltage, current, resistance and power from any two values. It sits in the Physics & Engineering section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Ohm's Law Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
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- No. The Ohm's Law Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
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- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Physics & Engineering?
- Motion, force, energy, electricity and wave calculations. You can browse the full Physics & Engineering category for related calculators.