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Formulas for Determining Amperes, Horsepower, Kilowatts, and KVA (Kilovolt
-Amperes)
| 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 is known |
KW x 1000
E |
KW x 1000
E x PF |
KW x 1000
1.73 x E x PF |
Amperes when
KVA known |
|
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 |
| KVA (Kilovolt - Amperes) |
|
I x E
1000 |
I x E x 1.73
1000 |
| Horsepower |
E x I x %EFF
746 |
E x I x %EFF
746 |
E x I x %EFFx PF x 1.73
746 |
% EFF = Percent Efficiency
OHM'S LAW
For Direct or Single Phase Non-Inductive Alternating Current.
Let:
I = Ampere Unit of current strength or rate of flow.
E = Volt Unit of electromotive force or electric pressure.
R = Ohm Unit of resistance to flow of current.
W = Watt Unit of power. |
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