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Ohm's Law Calculator
New옴의 법칙 · 옴의 법칙 계산기 · ohms law calculator · 전압 전류 저항 · V=IR
Ohm's Law Calculator
Enter any two of voltage, current, resistance, and power to get the rest.
Enter any two values.
Voltage
12 V
Current
3 A
Resistance
4 Ω
Power
36 W
V = I × R · P = V × I
How to use
- 1
Enter the two values you know among V, I, R, P.
- 2
The other two are computed via V=IR and P=VI.
- 3
Use Clear to reset and start over.
FAQ
Is this tool free?
Yes — it is completely free to use, with no account or sign-up required.
What is this tool?
Compute voltage, current, resistance, and power with Ohm's law. Enter any two of V (voltage), I (current), R (resistance), and P (power) and it works out the other two using V=IR and P=VI. Useful for electronics and physics work, and everything runs in your browser, free with no install.