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 357
he direction ofcurrent in the wires AB, and CD, is reversed, Flemings rule,and current flows from D to C, through brush P, now positive,then through the lamps in the opposite direction to that inFig. 307, and through brush M, now negative, to AB, to D,etc. In every revolution the polarity of the… … Fig. 307.—Simple Alternating Current Dynamo. At the instant depicted in the revolutionbrush M is positive. DYNAMO ELECTRIC MACHINES. 339 tiplied by the number of poles. The number of times whichthe alternations occur is usually expressed simply as the fre-quency, thus, a frequency of 7200…
Electricity · Magnetism
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