Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 480
n a second iscalled the frequency or periodicity of the alternations.In multipolar machines this number is greater than intwo = pole machines in proportion to the number ofpairs of poles. 477. Lag and Lead.—Alternating currents usually donot keep step with the alternating volts impressedupon the… … 454 ELEMENTARY LESSONS ON [chap. xv. later or earlier than those of the volts. These differ-ences in phase can be made to neutralise each other.The value by which, in the case of lag, the electromo-tive force must be divided to get the current, is calledthe impedance. A lagging current will also…
Electricity · Magnetism
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