justyourcalculatorOhm's Law Calculator
Enter any two values to get voltage, current, resistance and power.
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Ohm's Law Calculator
Voltage, current, resistance and power from any two
Results
12 V · 2 A
6 Ω · 24 W
- Voltage
- 12 V
- Current2,000 mA
- 2 A
- Resistance
- 6 Ω
- Power
- 24 W
How it was calculated
- I = V ÷ R = 12 ÷ 6 = 2 A
- P = V² ÷ R = 24 W
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How the ohm's law calculator works
Ohm's law says voltage = current × resistance (V = I × R). Power is voltage × current (P = V × I). Combining the two gives P = I² × R and P = V² ÷ R, so any two of the four values fix the other two.
Units: volts (V), amperes (A), ohms (Ω) and watts (W). Ohm's law holds for resistive loads; for AC circuits with motors or capacitors, use impedance and power factor instead.
Using and checking your result
Published by JustYourCalculator. Check the units and assumptions above, and compare a known example before relying on the output. Calculations use browser arithmetic and may round displayed values.
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