This calculator converts the given value of Volts and amperes to watts. This calculation is based on Watt's law put forward by James Watts a Scottish Inventor. Watts law is a simple relation between electric power, voltage and electric current.
( P= I × V)
where 'P' is electric power, 'I' is electric current and 'V' is voltage.
Put in the value of current( you can select either DC or AC current) in mA, A, or kA & the value of voltage in mV, V, or kV, and press the calculate button:
* Use e for scientific notation. E.g: 5e3, 4e-8, 1.45e12
The power P in kilowatts (kW) is equal to the current I in amps (A), times the voltage V in volts (V) divided by 1000:
P(kW) = I(A) × V(V) / 1000
The power P in kilowatts (kW) is equal to the power factor PF times the phase current I in amps (A), times the RMS voltage V in volts (V) divided by 1000:
P(kW) = PF × I(A) × V(V) / 1000
The power P in kilowatts (kW) is equal to square root of 3 times the power factor PF times the phase current I in amps (A), times the line to line RMS voltage VL-L in volts (V) divided by 1000:
P(kW) = √3 × PF × I(A) × VL-L (V) / 1000
The power P in kilowatts (kW) is equal to 3 times the power factor PF times the phase current I in amps (A), times the line to neutral RMS voltage VL-N in volts (V) divided by 1000:
P(kW) = 3 × PF × I(A) × VL-N (V) / 1000
Do not use typical power factor values for accurate calculations.
| Device | Typical power factor |
|---|---|
| Resistive load | 1 |
| Fluorescent lamp | 0.95 |
| Incandescent lamp | 1 |
| Induction motor full load | 0.85 |
| Induction motor no load | 0.35 |
| Resistive oven | 1 |
| Synchronous motor | 0.9 |