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Kinetic Energy Calculator
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Ohm's Law Calculator
Enter any two of voltage, current, resistance and power to calculate the other two with Ohm’s law.
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How to use this calculator
Enter your values. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.
Ohm’s law and power
V = I × R I = V ÷ R R = V ÷ I
P = V × I = I² × R = V² ÷ R
Example: 12 V across 6 Ω → I = 2 A and P = 24 W. These hold for resistive (ohmic) loads at DC; AC circuits with capacitors or inductors need impedance.
Frequently asked questions
What is Ohm’s law?
Current through a resistor equals voltage divided by resistance: I = V/R.
About this tool
- Written by
- [Author: to be assigned]
- Reviewed by
- Formula tests passed · human review pending
- Last updated
- 31 Oct 2026
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