Thomälen, Adolf, 1865-, Thomälen Adolf. Kurzes Lehrbuch der Electrotechnik. English · London, E. Arnold · leaf 106
being converted into heat by the hysteresisof the iron. We shall now consider more closely the manner in which the currentchanges from zero to its final steady value when a constant potential dif-ference V is applied to a coil or circuit having a resistance R and inductanceL. At any moment we have… … Fig. 87 Integrating, we have -^.t = loge (7 - i) + log, k = loge [k (7 - i)lwhere k is some constant, depending on the initial conditions. In our casewe assume that when t = o, i-=o which makes ^ = j, and -i 7 / T -S l — i » where e = 27i828, the base of the natural system of logarithms. Hencethe…
Electrical engineering
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