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Useful
Electrical Formulae for Determining Amperes, Horsepower,
Kilowatts and Kilovolts Amperes |
 |
| To
find |
Direct
Current |
Alternative
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 xEff x PF |
| Amperes
when Kilowatts is known |
KW
x 1000
E |
KW
x 1000
E x PF |
KW
x 1000
1.73 x E x PF |
| Amperes
when Kilovolt is 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 |
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Notes
:
I
= Amperes
E = Phase to phase volts
Eff = Efficiency expressed as decimal (95% = 0.95)
PF = Power factor expresses as decimal (85% = 0.85)
KW = Kilowatts
KVA = Kilovolt Amperes
HP = Horsepower
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Faq's
Useful Electrical Formulae