Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 481
la 138 Cta • =y = 0 = .55, power factor. c Apparent watts : By Formula 62 W = E x C = 1100 X 4.S6 = 5346 watts. True watte Bv Formula (137) W=EX C cos * = 1100 X 4.86 X .55 =2940.3 watts. d To measure alternating current power it is necessary to know theangle of lag if separate volt and ammeters… … Fig. 401. The effect of difference of phase, or the lagging of the currentbehind the E. M. F. upon the power expended, may be more clearlyshown by the sine curves in Figs. 401 to 403. Fig. 401 shows a cir-cuit containing ohmic re-sistance only, the currentwave not lagging behindthe E. M. F. wave ;…
Electricity · Magnetism
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