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air gap alternating current ampere-turns amperes amplifier angle anode armature armature current brush capacitor cathode cent Chap characteristics coil common commutator conductors connected constant copper current and voltage current flow curve d-c motors Determine effect efficiency electrical electrons equal equations EXERCISE feed-back flux density frequency full-load galvanometer grid bias grid voltage heating impedance impressed voltage increase induction motor industrial input insulation lagging losses machine magnetic circuit magnetic field magnetomotive force magnitude maximum measure meter negative normal obtained ohms operation oscillator oscillograph output parallel phase plate current plate voltage pole positive potential potentiometer power factor primary produce proportional rated reactance rectifier reduced relay resistor rotating rotor secondary shown in Fig shunt signal sine wave single-phase slot speed starting current stator supply switch synchronous temperature three-phase thyratron torque transformer triode usually vacuum tube vector diagram voltage drop wattmeter winding wire zero