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alternating current angle anode armature armature current armature reaction axis back E.M.F. brushes Calculate candle-power cathode cent circuit coil commutator component condenser conductor connected constant copper loss core curve direct current disc drop E.M.F. induced E₁ eddy current efficiency electrical electrons energy equal excitation filament flux frequency full load grid harmonic Hence hysteresis I₁ increase induced E.M.F. induction motor intake lamp load current London Univ machine magnetic field main motor maximum mercury mercury arc rectifier method normal ohms output polyphase position potential power factor primary produced proportional R₁ R₂ ratio reactance rectifier repulsion motor resistance reversed rotary convertor rotating field rotor secondary short-circuited shown in Fig shunt single-phase sinusoidal slip rings slots starting stator supply susceptor switch synchronous motor synchronous speed tapping temperature terminal voltage three-phase torque transformer volts wattless wattmeter watts wave form winding zero