# Electrical Formulas

 To Find Direct Current Alternating Current Single Phase Two-Phase* Four-Wire Three Phase Amperes when Horsepower is known HP x 746 HP x 746 HP x 746 HP x 746 E x EFF E x EFF x PF x 2 2 x E x EFF x PF E x EFF x PF x 1.73 Amperes when Kilowatts are known KW x 1000 KW x 1000 KW x 1000 KW x 1000 E E x PF 2 x E x PF E x PF x 1.73 Amperes when "KVA" is known KVA x 1000 KVA x 1000 KVA x 1000 E E x 1.73 Kilowatts E x I E x I x PF I x E x 2 x PF E x I x 1.73 x PF 1000 1000 1000 1000 Kilovolt-Amperes "KVA" I x E I x E x 2 E x I x 1.73 1000 1000 1000 Horsepower (Output) E x I x EFF E x I x EFF x PF I x E x 2 x EFF x PF E x I x EFF x PF x 1.73 746 746 746 746 E = VoltageI = AmpsPF = Power FactorEFF = EfficiencyHP = 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.