Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 85
are supplied 60 PRINCIPLES OF ELECTRICAL ENGINEERING [Chap, x with electromagnets the excitation of which can readily becontrolled. When the generator itself supplies this exciting current it is saidto be self excited; when the exciting current is supplied fromsome external source the machine is… … < j-—>
Electrical engineering
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