Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 142
field. 354 HAWKINS ELECTRICITY The Reverse Electromotive Force.—When an electric cur-rent flows through some portion of a circuit in which there is anelectromotive force, the current will there either receive or giveup energy, according to whether the electromotive force actswith or against the… … Fig. 393.—Force exerted on a current carrying conductor placed across a magnetic field. LetN, S, be the pole pieces of an ordinary electromagnet, having their faces flat and withonly a narrow air gap between. In this gap is stretched the vertical copper wire A B,kept taut by a strong spring at A;…
Electrical engineering
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