Practical electricity .. with questions and answers (1911)
Cleveland armature works, [from old catalog] comp, Lincoln, John C. [from old catalog] · [Cleveland, Ohio, Cleveland armature works] · leaf 230
^ork have been direct; that is, constantly fiov^ing inone direction. An alternating current is one which changesits direction many times every second; that is, the currentflows first in one direction and then in the opposite, thetime required for alternation or reversal varying from 1-50to 1-275 of… … Figure 78Two successive alternations or one cycle. Fig. 78 is the diagram of two successive alternations ana circuit. Two successive alternations, such as shown inthis figure, are called a period or a cycle. A two-pole ma-chine will produce one cycle every revolution. Fig. 79 220 shows a bi-polar…
Electricity
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