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Table 12. Electrical formulae
Desired Data Single Phase Three-Phase Direct Current
Kilowatts (kW)
I x V x PF
1000
3 x I x V x PF
1000
I x V
1000
Kilovolt-Amperes
kVA
I x V
1000
3 x V x E
1000
Electric Motor
Horsepower
Output (HP)
I x V x Eff . x PF
746
3 x I x V x Eff . x PF
746
I x V x Eff .
746
Amperes (I)
When Horsepower
is known
HP x 746
V x Eff
.
x PF
HP x 746
3 x V x Eff . x PF
HP x 746
V x Eff
Amperes (I)
When Kilowatts
are known
kW x 1000
V x PF
kW x 1000
3 x V x PF
kW x 1000
V
Amperes (I)
When kVA is
known
kVA x 1000
V
kVA x 1000
3 x V
Where:
V = Volts
I = Amperes
Eff = Percentage Efficiency
PF = Power Factor=
Watts
I x V