Electrical Power Calculator
Find electrical power in watts from voltage, current or resistance — DC, single-phase or three-phase AC — and the energy used over time.
Power
24 W
- Resistance (V ÷ I)
- 6 Ω
- Kilowatts
- 0.024 kW
- Horsepower
- 0.0321845 hp
Show the work
Power
P = V × I
12 × 2 = 24 W
How it works
DC: P = V·I = I²R = V²/R · AC single-phase: P = V·I·PF · AC three-phase: P = √3·V(line)·I·PF
Questions
- How does the electrical power calculator work?
- DC: P = V·I = I²R = V²/R · AC single-phase: P = V·I·PF · AC three-phase: P = √3·V(line)·I·PF.
- What do I need to enter?
- I know the, Voltage, Current, Resistance, Power factor, Hours of use. Optional fields can be left blank.
Related tools
- Resistors in Series & Parallel CalculatorFind the total resistance of resistors wired in series or in parallel.
- Ideal Gas Law CalculatorSolve the ideal gas law PV = nRT for pressure, volume, amount of gas (moles) or temperature.
- Wave Speed, Frequency & Wavelength CalculatorSolve v = fλ for a wave's speed, frequency or wavelength — sound, light, radio or water waves.
- Centripetal Force CalculatorFind the centripetal force and acceleration that keep an object moving in a circle, from its mass, speed (or rpm) and radius.
- Torque CalculatorFind the torque from a force applied at a distance from a pivot (lever arm), at any angle.
- Pressure Calculator (Force ÷ Area)Solve P = F ÷ A for pressure, force or area, in pascals, psi, bar and atmospheres.
Want this on your site? Embed the electrical power calculator.