Amps to Kilowatts Calculation | Line to neutral voltage | Line to Line voltage Calculation -lceted LCETED INSTITUTE FOR CIVIL ENGINEERS

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Aug 3, 2022

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:

 

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) × VL-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) × VL-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

 

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