Amps to Kilowatts Calculation | Line to neutral voltage | Line to Line voltage Calculation

Amps to Kilowatts Calculator

 

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

 

Example: Amps: 15, Volt: 230

P_(kW) = 15_(A) × 230_(V) / 1000

P_(kW) = 3.45 kW

P_(kW) = 3450 W

P_(kW) = 3450000 mW

 

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 single phase Amps to kilowatts calculation Example: Amps: 15, Volt: 230

P_(kW) = 1 × 15_(A) × 230_(V) / 1000

P_(kW) = 3.45 kW

P_(kW) = 3450 W

P_(kW) = 3450000 mW

 

 

AC three phase

Amps to kilowatts calculation

There are 3 LINE wires (current carrying) in a 3-phase supply at 120 degrees out of phase with each other and one single neutral wire. So, if you measure the potential difference between a LINE wire and a NEUTRAL (consuming single phase) wire you will get 220V. In contrast, between a LINE and another LINE (consuming triple phase) wire, the potential difference is 440V. 

The relationship goes like this:
VLL = √3 x VLN

 

Line to neutral voltage Calculation

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) × V_{L-N (V)} / 1000

 

Line to neutral voltage Calculation Example: Amps: 15, Volt: 230, PF: 1

P_(kW) = 3 × 1 × 15_(A) × 230 _(V) / 1000

P_(kW) = 10.35 watts

 

Line to Line voltage Calculation

The power P in kilowatts (kW) is equal to the 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) × V_{L-L (V)} / 1000

 

The line to Line voltage Calculation Example: Amps: 15, Volt: 230, PF: 1

P_(kW) = 1.732 × 1 × 15_(A) × 230 _(V) / 1000

P_(kW) = 5.9754 watts

 

 

STANDARD POWER FACTOR VALUES

Do not use standard power factor values for exact calculations.

Device	Typical power factor
Induction motor no load	0.35
Resistive load	1
Incandescent lamp	1
Resistive oven	1
Incandescent lamp	1
Induction motor full load	0.85
Synchronous motor	0.9
Fluorescent lamp	0.95