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80 per cent alternating current alternating-current ampere-hour amperes armature armature current assuming battery brake brushes Calculate capacitance cell cent power factor charge coil commutator conductor connected copper copper loss core current flow current input curve cycles delta connection designed determined diagram direct current direct-current motor discharge effect efficiency electric electromotive force energy equal equipment excitation flux frequency full-load given horsepower induction motor inductors insulation lagging lamps lighting line current line voltage load conditions losses machine magnetic circuit maximum meter method necessary no-load normal ohms operation output overload parallel phase poles polyphase Prob rated reactance resistance result rheostat rotation rotor secondary series motor short-circuited shown in Fig shunt motor single-phase squirrel-cage stator supply switch synchronous motor temperature three-phase tion torque transformer transmission usually vary vector voltage and current voltage drop voltage regulation volts watt-hour meter wattmeter watts winding wire zero