Ohm's Law Calculator
Solve voltage, current, resistance and power from any two known values.
Inputs
V
A
Ω
W
Results
- Voltage
- 12 V
- Current
- 2 A
- Resistance
- 6 Ω
- Power
- 24 W
Formula
V = I × R
P = V × I = I² × R = V² ÷ R
Assumptions & limits
- Enter only the two values named in “Known values”; leave the other two blank.
- DC or purely resistive AC loads.
Worked example
12 V × 2 A = 24 W; R = 12 ÷ 2 = 6 Ω.