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Useful Formulas
Formulas For Electrical Motors:
| To Find: | Direct Current |
Single Phase | Three Phase |
| Horse Power | E x I x EFF 746 |
E x I x EFF x PE 746 |
1.732 x E x I x EFF x PF 746 |
| Current | 746 x HP E x EFF |
746 x HP E x EFF x PF |
746 x
HP 1.732 x E x EFF x PF |
| Efficiency | 746 x HP E x I |
746 x HP E x I x PF |
746 x HP 1.732 x E x I x PF |
| Power Factor | --------- | Input Watts E x I |
Input Watts 1.732 x E x I |
E =
Volts
HP =
Horsepower PF
= Power Factor (decimal)
EFF = Efficiency (decimal) I = Amperes
Formulas For Electrical Circuits:
| To Find: | Direct Current | Single Phase | Three Phase |
| Amperes | Watts Volts |
Watts Volts x Power Factor |
Watts 1.732 x Volts x Power Factor |
| widtVolt-Amperes | -------------------- | Volts x Amperes Amperes | 1.732 x Volts x Amperes |
| Watts | Volts x Amperes | Volts x Amperes x Power Factor |
1.732 x Volts x Amperes x Power Factor |
| OHMS Law | Capacitance in Microfarads at 60 HZ. |
| Ohms = Volts/Amps (R=E/I) Amps = Volts/Ohms (I=E/R) Volts = Amps x Ohms (E=IR) |
Capacitance = 2650 x Amperes Volts Capacitance = 2.65 x kVAR (Volts) squared |