Electrical Horsepower (EHP) = watts / 745.7 = Volts * Amps * Power Factor / 745.7 - Electrical power input delivered to the motor
Brake Horsepower (BHP) = EHP * Motor Efficiency - Power delivered by the motor shaft to the impeller. This is not the same as THP or SFHP. BHP is a function of the load on the motor shaft and will change with Head, GPM and RPM.
Hydraulic HP (HHP) = BHP * Pumping Efficiency = Head (ft) * GPM / 3960 - Power delivered to the water. Sometimes called water HP (WHP) or pumping HP (PHP).
Motor Power Efficiency = BHP / EHP - I2R, magnetic and mechanical losses in the motor only.
Pumping Power Efficiency = HHP / BHP - Recirculation and internal friction losses in the wet end only.