To Find Direct Current Alternating Current
Single Phase Two-Phase* Four-Wire Three Phase
Amperes when Horsepower is known HP x 746


E x EFF

HP x 746


E x EFF x PF x 2

HP x 746


2 x E x EFF x PF

HP x 746


E x EFF x PF x 1.73

Amperes when Kilowatts are known KW x 1000


E

KW x 1000


E x PF

KW x 1000


2 x E x PF

KW x 1000


E x PF x 1.73

Amperes when "KVA" is known KVA x 1000


E

KVA x 1000


KVA x 1000


E x 1.73

Kilowatts E x I


1000

E x I x PF


1000

I x E x 2 x PF


1000

E x I x 1.73 x PF


1000

Kilovolt-Amperes "KVA" – I x E


1000

I x E x 2


1000

E x I x 1.73


1000

Horsepower (Output) E x I x EFF


746

E x I x EFF x PF


746

I x E x 2 x EFF x PF


746

E x I x EFF x PF x 1.73


746

E = Voltage
I = Amps
PF = Power Factor
EFF = Efficiency
HP = Horsepower

Note: Direct current formulas do not use (PF, 2, or 1.73)

  • Single phase formulas do not use (2 or 1.73)
  • Two phase-four wire formulas do not use (1.73)
  • Three phase formulas do not use (2)
  • * For three-wire, two phase circuits the current in the common
    conductor is 1.41 times that in either of the other two conductors.
0 Comments

Leave a reply

We’re Here to Help

Please enter your question below—or call us toll-free at 866-483-7289. To make sure we get your request or information to the right person, please include the nature of your issue or concern. If you’d like us to contact you, we’ll make every attempt to reach you within two business days.

Sending

Log in with your credentials

Forgot your details?