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3-phase A.C. supply alternating current amperes anode apparatus applied arrangement automatic battery cables candle-power capacity carbon cathode cells charge choking coil circuit coil conductors connected cooling copper cost current flow D.C. voltage discharge distribution distribution board earth efficiency electric electrode electrolyte energy filament flux frequency furnace fuses grid heater heating higher increased induction installation insulation lampholder lamps latter lighting load loss machine maximum Mercury Arc Rectifier mercury rectifier metadyne metal method motor motor-generator negative neutral obtained operation output overhead lines parallel phase plates plug pole positive pressure primary radiation reactance reduced Regulations resistance resistor rotary converter secondary sheath short-circuit shown single-phase slip rings steel substations switch synchronous Table temperature terminals transformer transverter tube tungsten valve vapour voltage regulation welding winding wiring rules