Electrical Formulas.27 - Generac Power Systems NP Series Installation Manual

ELECTRICAL FORMULAS
TO FIND KNOWN VALUES
1-PHASE
3-PHASE
KILOWATTS (kW)
Volts, Current, Power Factor
ExI
1000
Exlx1.73xPF
1000
KVA
Volts, Current
E
X
I
•
■
1000
ExI 1.73
1000
AMPERES
kW, Volts, Power Factor
kWxIOOO ■
E
kWx 1000
E
X
1.73
X
PF
WATTS
Volts, Amps, Power Factor
Volts
X
Amps
E
X
1
X
1.73
X
PF
NO. OF ROTOR
POLES
Frequency, RPM
FREQUENCY
RPM, No. of Rotor Poles
RPM
Frequency, No. of Rotor Poles
kW (required for
Motor)
Motor Horsepower, Efficiency
HP
X
0.746
Efficiency
HP
X
0.746
Efficiency
RESISTANCE
Volts, Amperes
E
1
E
1
VOLTS
Ohm, Amperes
IxR
_
IxR
AMPERES Ohms, Volts
E
R
E
R
E = VOLTS I = AMPERES R = RESISTANCE (OHMS) PF = POWER FACTOR
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