Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 37
irection as to oppose the in- 12 PRINCIPLES OF ELECTRICAL ENGINEERING [Chap, in crease of the current. This opposing e.m.f., called the e.m.f. ofself induction, exists only while the current is changing. If, after the current has reached its final value, the switch k issuddenly opened, the current… … Fig. 18.—Growth of current in a coil. as to oppose the decrease of the current; this e.m.f. is generallylarge enough to maintain the current between the switch contactsas they are being separated and accounts for much of the flashingthat is seen when a switch is opened in a circuit carrying…
Electrical engineering
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-79-9.webp)
