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A text-book of electrical engineering; (1920)

Thomälen, Adolf, 1865-, Thomälen Adolf. Kurzes Lehrbuch der Electrotechnik. English · London, E. Arnold · leaf 262

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8) on page 245. The current curve is steepest atthis point, which means that, although there is no current at the moment,yet the rate at which the current, and with it the flux, is changing is then amaximum. That the e.m.f. induced in the coil is negative follows at oncefrom the fact that it… … Fig. 238 moment when the current is a maximum, the current curve in Fig. 238 isparallel to the base, and for an instant both current and flux are constant.There is therefore no cutting of lines at this moment, and the dotted curvemust pass through the base line at the point representing a = 90°. By…

Electrical engineering

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