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activity expended alternating alternating currents alternating-current motors amperes arma armature circuit armature core back pressure brushes cent coils commutator conductor connected continuous-current copper cubic centimetre current passes cycle diphase system disc driving drop of pressure duce dynamo E. M. Fs efficiency electric current electric motor electromagnetic motor employed excited exerted feet field frame field magnets flux passing flux produced foot-pounds friction full load horse-power induction motor insulated iron machine magnetic circuit magnetic flux magnetic resistance mains mechanical miles motion motor shown nected number of turns Ohm's law ohms operated pair pipe pounds pounds-per-second pulley reactance rent represented in Fig reservoir reverse the direction revolutions per minute revolutions per second rheostat rings rotating field secondary circuit shaft shown in Fig speed star wheel supplied synchronous tion toothed-core armature torque transformer transmission of power transmitted triphase trolley wire turbine ture uniphase volts watts weight winding wound
Page 160 - Kilovolt — One thousand volts. Kilowatt — One thousand watts. Kilowatt-hour — The amount of work equal to that performed by an activity of one kilowatt maintained steadily for one hour. An amount of work equal to 3,600,000 joules. One thousand watt-hours.
Page iii - been prepared with the object of rendering the principles of electric motors clear to those who are not specially trained in electrotechnics.
Page 134 - The reluctance of most substances is practically the same as that of air, and is not affected by the quantity of flux which passes through it.
Page 258 - ... in the same direction, so far as the external circuit is concerned.