Amps (A) to kilowatts (kW) calculator.
* Use e for scientific notation. E.g: 5e3, 4e-8, 1.45e12
DC amps to kilowatts calculation
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
AC single phase amps to kilowatts calculation
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
AC three phase amps to kilowatts calculation
Calculation with line to line voltage
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
Calculation with line to neutral voltage
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
Typical power factor values
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 |
Ampere definition
Ampere or amp (symbol: A) is the unit of electrical current.
The Ampere unit is named after Andre-Marie Ampere, from France.
One Ampere is defined as the current that flows with electric charge of one Coulomb per second.
1 A = 1 C/s
Watt definition
Watt is the unit of power (symbol: W).
The watt unit is named after James Watt, the inventor of the steam engine.
One watt is defined as the energy consumption rate of one joule per second.
1W = 1J / 1s
One watt is also defined as the current flow of one ampere with voltage of one volt.
1W = 1V × 1A
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