|
 Useful
Electrical Formulas for Determining Amperes, Horsepower, Kilowatts
and Kilovolt Amperes
| |
|
Alternating
Current |
To
Find |
Direct
Current |
Single-Phase |
Three-Phase |
Amperes
when Horsepower
is known |
HP
x 746
E x Eff |
HP
x 746
E x Eff x PF |
HP x 746
1.73 x E x Eff x PF |
Amperes
when Kilowatts
are known |
KW
x 1000
E |
KW
x 1000
E x PF |
KW
x 1000
1.73 x E x PF |
Amperes
when Kilovolt Amperes
are known |
KVA
x 1000
E |
KVA
x 1000
E |
KVA x
1000
1.73 x E |
| Kilowatts |
I
x E
1000 |
I
x E x PF
1000 |
I
x E x 1.73 x PF
1000 |
| Kilovolt
Amperes |
I
x E
1000 |
I
x E
1000 |
I x E
x 1.73
1000 |
Horsepower
(Output) |
I
x E x Eff
746 |
I
x E x Eff x Pf
746 |
I
x E x 1.73 x Eff x PF
746 |
Notes:
I = Amperes; E = Phase-to-Phase Volts; Eff. = Efficiency expressed
as a decimal (95% = 0.95); PF = Power Factor expressed as a decimal
(85% = 0.85); KW = Kilowatts, KVA = Kilovolt Amperes; HP = Horsepower.
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