| Does 22 formulas seem like too many? Look close and you'll
find a pattern. They are all variants of only 6 formulas.
When you go from DC to 1 phase, you have to factor in Power Factor (PF). Then when you move up to 3 wire, single phase, you simply double your voltage relative to ground. A 3 phase system feeds your motor from 3 different wires with phases seperated by 120 degrees so you use a multiplier of 1.73 rather then 2. |
| Find | Amps with HP | Amps with KW | Amps with KVA | KW | KVA | HP |
| DC | HP x 746 E x %Eff |
KW x 1000 E |
E x I 1000 |
E x I x %Eff 746 |
||
| Single Phase | HP x 746 E x %Eff x PF |
KW x 1000 E x PF |
KVA x 1000 E |
E x I x PF 1000 |
E x I 1000 |
E x I x %Eff x PF 746 |
| 1 Phase, 3 Wire | HP x 746 E x %Eff x PF x 2 |
KW x 1000 E x PF x 2 |
KVA x 1000 E x 2 |
E x I x PF x 2 1000 |
E x I x 2 1000 |
E x I x %Eff x 2 x PF 746 |
| 3 Phase | HP x 746 E x %Eff x PF x 1.73 |
KW x 1000 E x PF x 1.73 |
KVA x 1000 E x 1.73 |
E x I x PF x 1.73 1000 |
E x I x 1.73 1000 |
E x I x %Eff x 1.73 x PF 746 |
copywrite & by Jason Wilson