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