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3-phase advantage alternating current alternating-current ammeter ampere ampere-hour apparatus applications armature arrester automatic autotransformer capacitor capacity cent Chap charge circuit breaker coil conductor connected copper cost current transformer cycles diagram direct current direct-current efficiency electric equipment feeder field frequency full-load furnace fuse heating horsepower illumination illustrated in Fig indicated induction motor installation instrument insulation kilovolt kilovolt-ampere kilowatt kind lamps lighting line drop line voltage load locomotive machine magnetic maximum metal motor-generator set obtained operation overcurrent phase plant poles polyphase potential transformer power factor primary Problem ranges rated ratio reactance relay resistance resistor rheostat rotating rotor secondary shunt single-phase Specify speed squirrel-cage starting steel suitable switch switchboard synchronous condenser synchronous converter synchronous motor Table temperature three-phase three-wire tion torque trip trolley units usually voltage drop voltage regulation voltmeter volts watthour meter wattmeter welding winding wire