# ELECTRICAL FORMULA

VALUE | 1-PHASE | 3-PHASE |
---|---|---|

WATTS (W) | I X E X PF | I x E x 1.73 x PF |

KILOWATTS (kW) | E x L x PF 1000 |
E x I x 1.73 x PF 1000 |

AMPERES (I) | kW x 1000 E x PF |
kW x 1000 E x 1.73 x PF |

KILOVOLT AMPERES (kVA) | I x E 1000 |
I x E x 1.73 1000 |

FREQUENCY (Hertz orf) | Rotor Poles x RPM 120 |
Rotor Poles x RPM 120 |

RPM (n) | Hertz x 120 Rotor Poles |
Hertz x 120 Rotor Poles |

NUMBER OF ROTOR POLES (P) | Hertz x 120 RPM |
Hertz x 120 RPM |

POWER FACTOR (PF) | Actual Watts I x E |
Actual Watts I x 1.73 x E |

HORSEPOWER (HP) | I x E x PF 746 x EFF |
I x E x 1.73 x PF 746 x EFF |

AMPERES (when kW is known) | kW x 1000 E x PF |
kW x 1000 E x 1.73 x PF |

AMPERES (when kVA is known) | kVA x 1000 E |
kVA x 1000 E x 1.73 |

I | = | current amperes |

E | = | voltage in volts |

W | = | watts |

kW | = | power in kilowatts |

kVA | = | apparent power in kilo-volt-amperes |

HP | = | output power in horsepower |

RPM(n) | = | motor speed in revolutions per minute |

ns | = | synchronous speed in revolutions per minute |

Rotor Poles(P) | = | number of poles |

Hertz(f) | = | frequency in cycles per second(CPS) |

T | = | torque in pound-feet |

EFF | = | efficiency as a decimal |

PF | = | power factor as a decimal |

HP | = | horsepower |