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Electrical Formulas

 


Electrical Formulas
To FindAlternating Current
Single-PhaseThree-Phase
Amperes when horsepower is knownHP x 746

E x Eff x pf
HP x 746

1.73 x E x Eff x pf
Amperes when kilowatts are knownKw x 1000

E x pf
Kw x 1000

1.73 x E x pf
Amperes when kva are knownKva x 1000

E
Kva x 1000

1.73 x E
KilowattsI x E x pf

1000
1.73 x I x E x pf

1000
KvaI x E

1000
1.73 x I x E

1000
Horsepower = (Output)I x E x Eff x pf

746
1.73 x I x E x Eff x pff

746

I = Amperes; E = Volts; Eff = Efficiency; pf = Power Factor; Kva = Kilovolt-amperes; Kw = Kilowatts








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