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air gap alternating current ammeter ampere-hour ampere-turns amperes angle anode applied voltage armature current armature reaction axis back E.M.F. booster brush bus-bars calculated candle-power cell characteristic commutator component conductors connected constant copper loss core curve direct current E.M.F. induced eddy current efficiency electrical electrodes energy equal excitation feeder filament flux frequency full load harmonic Hence hydrogen hysteresis Imax increase induced E.M.F. induction motor intake iron losses lagging lamp line current load current London Univ machine magnetic field maximum method obtained output parallel polyphase position power factor pressure coil primary produced proportional ratio reactance represented rotary converter rotating field rotor secondary series motor short circuit shown in Fig shunt side single phase slip rings slots stator supply switch synchronous motor synchronous speed temperature terminal voltage three phase torque transformer vector diagram voltmeter volts wattmeter watts winding wire zero