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3-phase A.C. circuit alternating current ammeter ampere-hours amperes apparatus applied armature battery boiler break-down bus bars cables capacity cell Chapter charge circuit breaker coil condenser conductor connected constant copper core cost current flows curve cycles deflection dielectric strength dynamo earth eddy currents effect efficiency electrical electrolyte electrostatic energy engines feeder flux frequency fuse galvanometer heat higher hysteresis increases induction induction motor installation instrument insulation iron lamps latter load factor loss machine magnetising measured mechanical metal meter motor Ohm's Law operating output overhead lines phase pipe plant pointer pole power factor practically pressure produced rated reactance reduced relay resistance rotor scale short-circuit shunt speed station steam steel supply switch synchronous temperature transformers transmission turbine units utilised varies voltage voltmeter watt-hour meter wattless wattmeter wave winding wire