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Common Electrical Formulas
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 are 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.
Common Electrical Formulas
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 are 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.