ElEctrical formulas
TO FIND
KNOWN VALUES
1-PHASE
3-PHASE
KILOWATTS (kW)
Volts, Current, Power Factor
E x I
1000
E x I x 1.73 x PF
1000
KVA
Volts, Current
E x I
1000
E x I x 1.73
1000
AMPERES
kW, Volts, Power Factor
kW x 1000
E
kW x 1000
E x 1.73 x PF
WATTS
Volts, Amps, Power Factor
Volts x Amps
E x I x 1.73 x PF
NO. OF ROTOR POLES
Frequency, RPM
2 x 60 x Frequency
RPM
2 x 60 x Frequency
RPM
FREQUENCY
RPM, No. of Rotor Poles
RPM x Poles
2 x 60
RPM x Poles
2 x 60
RPM
Frequency, No. of Rotor Poles
2 x 60 x Frequency
Rotor Poles
2 x 60 x Frequency
Rotor Poles
kW (required for Motor)
Motor Horsepower, Efficiency
HP x 0.746
Efficiency
HP x 0.746
Efficiency
RESISTANCE
Volts, Amperes
E
I
E
I
VOLTS
Ohm, Amperes
I x R
I x R
AMPERES
Ohms, Volts
E
R
E
R
E = VOLTS
I = AMPERES
R = RESISTANCE (OHMS)
PF = POWER FACTOR
0G9266revA.indd 2
10/15/2008 11:25:38 AM
