Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 345
e.m.f. orcurrent is the time in sec-onds required to complete one cycle. Thus the period of a60-cycle e.m.f. or current would be %o of a second and of a25-cycle e.m.f. or current 1^5 of a second. Two electromotive forces or currents are said to be insynchronism when they have the same frequency.… … 360 spective cycles at the same time. Thus the current (I),and the e.m.f. (E), Fig. 271, are in phase because they bothpass through corresponding values of their cycles at the sametime. Any number of e.m.f.s or currents are said to be displacedin phase when they do not pass through corresponding…
Electrical engineering
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