The Basic Power Calculation
The first thing we need to know is about 1KW = 1000W or 1KA = 1000A
Single Phase Power
– KW = (Volts x Amps x PF)/1000
Three Phase Power
– KW = (Volts x Amps x PF x 1.73)/1000
Example: our device show 8.5A and 380V, then we calculate the KW? we know the Power Factor (PF) in the rang 0.8 to 0.95 refer to the device. right now we choose PF equals 0.85.
Answer is KW = (380 x 8.5 x 0.85 x 1.73)/1000 = 4.74 kW, so your device need power 4.74KW
– KVA = (Volts x Amps) / 1000
– KVA = (Volts x Amps x 1.73) / 1000
Other thing of the Unity Power Factor
– Power (Watts) = Volts x Amps
– Power (Watts) = I²R
– Power (Watts) = V²/R
AC Efficiency and Power Factor
– Efficiency = (746 x HP) / (E x I x PF)
– Power Factor = Input Watts / (V x A)
– Efficiency = (746 x HP) / (E x I x PF x 1.732)
– Power Factor = Input Watts / (E x I x 1.732)
( I ) Current is what flows on a wire or conductor like water flowing down a river. Current flows from negative to positive on the surface of a conductor. Current is measured in (A) amperes or amps.
( E ) Voltage is the difference in electrical potential between two points in a circuit. It’s the push or pressure behind current flow through a circuit, and is measured in (V) volts.
( R ) Resistance determines how much current will flow through a component. Resistors are used to control voltage and current levels. A very high resistance allows a small amount of current to flow. A very low resistance allows a large amount of current to flow. Resistance is measured in ohms.
( P ) Power is the amount of current times the voltage level at a given point measured in wattage or watts.