Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 359
current of 5 amperes 309.—Students Experimental Dynamoand Motor. to now lor one secondin a positive direction, and then be automatically reversedand flow for one second in the opposite or negative direction,and reversed again, this cycle of events continuing at regularintervals whilethe current… … Fig. 310.—Graphical Representation of anAlternating Current. of time. The vertical line, AM, at rightangles to it is divided into distances representing units ofcurrent, the current being in a positive direction when indi-cated above PK, and negative, when below PK. When the DYNAMO ELECTRIC…
Electricity · Magnetism
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