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airgap alternating current ampere-turns amperes angle anode current anode voltage armature armature current assumed brushes Calculate candlepower capacitance capacitor cathode cent centre charge coil component conductor connected in series constant copper core coulomb cross-sectional area current taken curve dielectric direction e.m.f. induced effect efficiency electric flux density electrons Example expression farads filament flux density frequency full-load galvanometer Hence hysteresis impedance increase inductive reactance instantaneous value iron loss joules lagging lamp length line current load luminous machine magnetic circuit magnetic flux magnetizing force maximum value mercury-vapour lamp metre mutual inductance negative neutral output parallel per-unit permittivity phase plates pole positive potential gradient power factor primary r.m.s. value rectifier represented rotating rotor secondary windings shown in Fig single-phase slots speed star-connected stator supply voltage surface synchronous temperature terminal voltage three-phase torque transformer triode vector diagram voltage and current volts wattmeter watts zero