
10-18
Reference
Electrical Formulas
(cont.)
Where:
kVA = Kilovolt-Amperes
I = Current (Amperes)
E = EMF or Voltage (Volts)
Where:
kW = Kilowatts
I = Current (Amperes)
E = EMF or Voltage (Volts)
PF = Power Factor
W = Watts
V = Volts
kVA = Kilovolt-Amperes
Calculating Motor Amperes
Where:
HP = Horsepower
E = EMF or Voltage (Volts)
Eff = Efficiency of Motor (%/100)
kVA = Kilovolt-Amperes
kW = Kilowatts
PF = Power Factor
kVA (1-phase)
IE
×
1,00
-----------=
kVA (3-phase
IE
×
1.73
×
1,00
-------------------------=
kW (1-phase)
IE
×
PF
×
1,00
---------------------=
kW (2-phase)
IE
×
PF 1.42
××
1,00
------------------------------------=
kW (3-phase)
IE
×
PF 1.73
××
1,00
------------------------------------=
PF
W
VI
×
---------
kW
kVA
-------==
Motor Amperes
HP 74
×
E1.73
×
Eff
×
PF
×
-------------------------------------------=
Motor Amperes
kVA 1,00
×
1.73 E
×
-------------------------=
Motor Amperes
kW 1,00
×
1.73 E
×
PF
×
-----------------------------=
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