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Equations

Electric Motor

  

To Find: 

Given: 

Single Phase 

Three Phase 
Kilowatts (kW)    Volts * Amps * PF/1000  1.73 * Volts * Amps * PF/1000 
Kilovolt-Ampere (kVA)    Volts * Amps/1000      1.73 * Volts * Amps/1000 
Horsepower (hp)   Volts * Amps * Eƒƒ * PF/746  1.73 * Volts * Amps * Eƒƒ * PF/746 
Amps  Hp  Hp * 746/Volts * Eƒƒ * PF  Hp * 746/1.73 * Volts * Eƒƒ * PF 
Amps Power kW  kW * 1000/V * PF  kW * 1000/1.73 * Volts * PF 
Amps  kVA  kVA * 1000/Volts  kVA * 1000/1.73 * Volts 

 

Hydraulic Power

 To Find:

Given: 

Horsepower (hp) 

Kilowatts (kW) 
Power  Head  Feet * Flow Rate * SG/3956  9.81 * Meters * Flow Rate * SG 
Power  Pressure Drop  psi * Flow Rate/1714  kPa * Flow Rate/1000 
Power  work*  Work * Flow Rate * SG/3956  Work * Flow Rate * SG/1000 

                            

* For Horsepower (hp) Work units are (ƒt-lbƒ/lbm); for Kilowatts (kW) Work units are (J/kg)

                                        - Flow Rate for Horsepower (hp) is Gallons/Minute (gpm)
                                        - Flow Rate for Kilowatts (kW) is Liters/Second (L/s)

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