ELECTRICAL FORMULAS
COMMONLY USED
ELECTRICAL FORMULAS

To Obtain

SINGLE PHASE
(Alternating Current)

THREE PHASE
(Alternating Current)
Kilowatts

V x l x pf

1000

1.732 x V x l x pf

1000
kV•A

V x l

1000

1.732 x V x l

1000
Amperes
(kW known)		 kW x 1000

V x pf

 kW x 1000

1.732 x V x pf
Amperes
(motor hp known)		 hp x 0.746

V x pf x Efficiency		 hp x 0.746

1.732 x V x pf x Efficiency
Amperes
(kV•A known)		 kV•A x 1000

V		 kV•A x 1000

1.732 x V
Horsepower
(kW unknown)		 kW

0.746 x Efficiency (Generator)		 kW

0.746 x Efficiency (Generator)
Horsepower
(generator efficiency unknown)		 kW

0.746 x 0.93		 kW

0.746 x 0.93
kW input
(motor hp known)		 hp x 0.746

Efficiency (Motor)		 hp x 0.746

Efficiency (Motor)
kW input (motor efficiency? unknown) hp x 0.85 hp x 0.85