Maker & Reference
Power + Ohms Law Calculator
V=IR, P=VI, P=I²R, P=V²/R. Enter any two and the calculator gives all four.
Voltage (V)
—
- Current (A)
- —
- Resistance (Ω)
- —
- Power (W)
- —
FAQ
Why memorize this? +
Foundation of all electrical work. Sizing wire, picking fuses, calculating heat dissipation in resistors — all of it uses these four equations.
DC only? +
For pure resistive AC, yes. Reactive loads (motors, transformers) need power factor calculations.