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 482
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 … Fig. 403. this current does not represent energy expended. Such a current atright angles to the E. M. F. is for tiiese reasons known as a wattles^current, because the product of such a current by the E. M. F. dues notrepresent anywatts expended.The currentmay be lookedupon as being re-solved into…
Electricity · Magnetism
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