Electrical formulas, 1 ^ e – Generac Power Systems 9344-1 User Manual
Page 39
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ELECTRICAL FORMULAS
TO FIND
KNOWN VALUES
1-PHASE
3-PHASE
KILOWATTS
(kW)
Volts, Current, Power Factor
ExI
E X T X 1.71 X PF
1000
1000
KVA
Volts,
Current
ExT !
E.
x
I
a
L73
1000 ;
1000
AMPERES
kW, Volts, Power Factor
kWxlOOO
kWx 1000
E i
Ex 1.73 xPF
WATTS
Volts, Amps, Power Factor
Volts
X
Amps
E
X
I
X
1.73
X
PF
NO. OF ROTOR
Frequency, RPM
.
2
X
60 X Frequency
2
X
6flxFie,quency
POLES
RPM
RPM
FREQUENCY
RPM,
No.
of Rotor Poles
RPM X Poles
RPM X Poles
2x60 i
2 x 6 0
RPM
Frequency, No. of Rotor Poles
2 X 60 X Frequency
2 X 6 0 X
Frequency
Rotor Poles
:
Rotor Poles
kW (required for
Motor Horsepower, Efficiency
HP X 0.746 :
HP X 0.746
Motor)
Efficiency
Efficiency
RESISTANCE
Volts, Amperes
E
:
E
I
I
VOLTS
Ohm, Amperes
IxR
IxR
AMPERES
Ohms, Volts
1 ^
E
1 R
1
R
E = VOLTS
I = AMPERES
R = RESISTANCE (OHMS)
PF = POWER FACTOR