AC GENERATOR THEORY AC Generators Therefore, the equivalence of these units is expressed with a conversion factor as follows. 550^ft   lbf sec 1hp 1  kW 737.6^ft   lbf sec 1000  w 1  kW 746^W hp Input Power =  5  hp  x  746^W hp 3730  W Output Power   =  2  kW 2000  W Efficiency =^Output Input 2000  W 3730  W 0.54  x  100 54% Summary The important information covered in this chapter is summarized below. AC Generator Theory Summary The frequency of the generated voltage in an AC generator can be calculated by multiplying the number of poles by the speed of the generator and dividing by a factor of 120. The three losses found in an AC generator are: - Internal  voltage  drops  due  to  the  internal  resistance  and  impedance  of  the generator - Hysteresis losses - Mechanical losses Efficiency of an AC generator can be calculated by dividing the output by the input and multiplying by 100. ES-10 Page 8 Rev. 0