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acid aerial circuit aether alternating current alternating voltage ammeter amperes amps angle anode anode current applied voltage armature arranged atom back E.M.F. battery brushes capacity cell charge coil condenser conductor connected counter E.M.F. coupling current flowing curve damping decrease dielectric direct current dynamo E.M.F. induced earth effect electric electrons energy equal Example farads field magnet filament flux greater half cycle heat Hence heterodyne high frequency illustrated in Fig increase induced E.M.F. insulation iron jars joined in series joules lamps LC value lines of force load loop machine magnetic field magnetising metres mics molecules motor mutual inductance negative ohms oscillation oscillatory parallel phase plates poles positive produced radiation rectified resistance resonant result rotary converter rotating self-inductance shown in Fig shunt signal slip rings spark gap speed supply telephone terminals transformer transmitting tuned turns unit valve vary volts watts wave-length wavemeter wire wireless zero