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alternating alternating current ampere angle angular anode anode voltage applied p.d. applied voltage armature atom axis calculated capacitance capacitor cathode characteristic charge circuit coil commutator component conductor connexion constant copper loss curve dielectric diode direction distribution electric field electrons energy equal equation Example excitation field strength flux density frequency full-load function germanium given gives grid Hence impedance increase induced e.m.f. induction motor instant lamp leakage lines of force load machine magnetic field magnitude maximum mercury method negative no-load normal operation output p-n junction parallel particle phase positive power factor primary radiation ratio reactance rectifier repulsion motor resistance resonance result reverse RL circuit rotating rotor secondary semiconductor short-circuit shown in Fig single-phase stator supply surface synchronous speed temperature terminal three-phase thyratron torque transformer vector diagram velocity voltage drop wave wavelength winding zero