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Home > Science, Technology & Agriculture > Energy technology and engineering > Electrical engineering > Theoretical and Practical Electrical Engineering Volume 1; Comprising a Course of Lectures Given at the Bliss Electrical School Upon the Principles an
Theoretical and Practical Electrical Engineering Volume 1; Comprising a Course of Lectures Given at the Bliss Electrical School Upon the Principles an

Theoretical and Practical Electrical Engineering Volume 1; Comprising a Course of Lectures Given at the Bliss Electrical School Upon the Principles an


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...high magneto-motiveforce. It is thus capable of producing wide changes in field flux across it by its varying reaction. After the machine has built up, Sw may be opened, provided there is an external circuit through which the current can be diverted. The current is thus transferred from the short circuit to the external load. Assume a load of a certain number of lamps in series, and the machine delivering a constant current of 10 amperes with the switch, Sw, open. To turn out a lamp it is necessary to place a short circuit around it as at C. This reduces the external resistance. The natural effect would be an increase in current, which, passing through the series field, would produce more voltage and still more current. That is what would happen with an unsaturated field with an armature of small reaction. What actually happens is this: the slight increase in current accompanying the short circuiting of the lamp brings about a considerable increase in armature reaction. This opposes and reduces the field flux, which crosses the armature and actually brings about a reduction in voltage, preventing any further increase in current. If the switch. C, is opened, the first effect will be to slightly reduce the current, due to the insertion of the lamp, L. The armature reaction now decreases sufficiently to allow the field to establish more flux across it. This causes a rise in voltage sufficient to care for the added resistance of the lamp L without an appreciable reduction in current. Thus, while the resistance of the external circuit may vary widely, the voltage varies almost as widely due to the reaction of the armature on the field flux and the resulting current changes very little. It does no harm to short-circuit a series dynamo because the armature reactio...


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Product Details
  • ISBN-13: 9781130149777
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 201
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1130149773
  • Publisher Date: 06 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 372 gr


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Theoretical and Practical Electrical Engineering Volume 1; Comprising a Course of Lectures Given at the Bliss Electrical School Upon the Principles an
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