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air gap alternating current ampere-turns amperes angle anode applied voltage armature armature current armature reaction back E.M.F. booster brush calculated candle-power cathode cent characteristic charge circuit commutator component condenser conductors connected constant convertor copper loss core curve demagnetizing direct current drop E.M.F. induced eddy current efficiency electrical electrons energy equal excitation feeder filament flux frequency full load given Hence hysteresis increase induced E.M.F. induction motor intake iron lamp lines of force load current London Univ machine magnetic field maximum method normal ohms output parallel phase pole polyphase position potential power factor primary produced proportional ratio reactance rectifier Repulsion Motor resistance reversed rotary rotary converter rotating field rotor secondary short-circuited shown in Fig shunt single-phase slip rings slots starting stator supply switch synchronous motor synchronous speed temperature terminal voltage three-phase torque transformer volts wattmeter watts winding zero