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alternating alternating current ammeter amperes applied armature automatic auxiliary battery brushes cable capacity carbon cell cent chuck circuit circuit breaker commutator conductors conduit connected constant copper core d.c. motors deflection discharge driving dynamo earth efficiency Electrical electrodes electrolyte excited field flux frequency full-load fuses galvanometer gear heating increases induction motor instrument insulation resistance iron joint lamp latter light load machine magnetic maximum measured mechanical megohms mercury metal meter motor-generator moving coil obtained ohmmeter ohms operated output overload phase plates pole power factor pressure reactance rectifier reduced regulator repulsion motor reversed rheostat rotary converter rotor running short-circuit shunt single-phase slip rings starter starting torque stator steel substation supply switch synchronous motor Table temperature terminals three-phase torque traction transformer unit varies voltage voltmeter volts wattmeter watts welding winding wire