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
negative ; consequently the product of their valuesat that instant are negative, and the corresponding point on thepower curve is belowthe horizontal. Thismeans that during theintervals of time, aband cd, negative workis being done ; or, inother wrords, the cir-cuit, instead of havingwork done on… … Fig. 402. as much above the horizontal as below it, the circuit returning asmuch energy as is expended in it, the negative power at c and dbeing equal to the positive power at a and b. The total work donein this case is, therefore, zero, and although a current is flowing, ALTERNATING CURRENTS. 463
Electricity · Magnetism
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