Electrical Power Calculator (Ohm's Law + Power Wheel)
Enter any two of Voltage, Current, Resistance, or Power and calculate the other two using Ohm's Law and the power formula.
Electrical Values
Ohm’s Law and the Power Wheel let you find any electrical value from two knowns.
Ohm’s Law: V = I × R
Power: P = V × I
All 12 formulas:
| Known | Find V | Find I | Find R | Find P |
|---|---|---|---|---|
| V, I | — | — | V/I | V×I |
| V, R | — | V/R | — | V²/R |
| V, P | — | P/V | V²/P | — |
| I, R | I×R | — | — | I²×R |
| I, P | P/I | — | P/I² | — |
| R, P | √(P×R) | √(P/R) | — | — |
Units:
- Voltage (V) in Volts
- Current (I) in Amps
- Resistance (R) in Ohms
- Power (P) in Watts