Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 222
nd Voltage.—The averagevalue of an alternating current or voltage is zero because similarsets of positive and negative values occur. The term averageis generally applied to the average value during the positive partof a cycle as indicated in Fig. 216. Eav, the average e.m.f. = - Em1 lav, the… … •Fig. 217. If an alternating current i = Im sin 6 is forced through thesame resistance,-then the power transformed into heat at any in- lEav X T = Emsin d dd therefore 2ET 2 „ 198 PRINCIPLES OF ELECTRICAL ENGINEERING [Chap, xxvii stant = i2R watts and the average power transformed into heat = the…
Electrical engineering
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