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Alternate Current Apparatus; Being Part II of Electricity for Engineers

Alternate Current Apparatus; Being Part II of Electricity for Engineers


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER V. INDUCTION COILS, CONVERTERS, TRANSFORMERS (Concluded). f An induction coil can be operated to transform the energy of the primary current into an alternating current having a greater potential but of less volume than the exciting or primary current or into a current of lower potential and greater volume. This latter effect is what is desired when the current is to be used for the lighting of buildings. By correctly proportioning the winding on the cores any intensity or volume of current may be obtained from the secondary coil, but for obvious reasons the energy obtained from the secondary circuit can never be fully equal to that of the primary current. The high potential of the primary alternating current, which in one system is 2,000 volts, while in another it is 3,000 volts, may be reduced to a 50 or 100 volt current in the secondary by making the number of turns of wire in each circuit of the transformer bear the same ratio as do the potentials in the two circuits. This would be the case if there was no resistance to be overcome, and by considering that one volt per turn in the primary circuit will induce an electro-motive force of one volt per turn in the secondary circuit, the calculation becomes quite simple. Where the reduction is to be made from a 3,000 volt current to one of 100 volts the number of turns of wire in each coil would be in the proportion of 3,000:100 or 30:1, that is there would be thirty times as many turns of wire in the primary coil as in the secondary. The design of transformers varies considerably, as each designer has his own ideas as to what is the best form, and the relative proportion of iron and copper is calculated so as to combine the greatest efficiency with the lowest cost of manufacture. As the copper wire used is quite...


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Product Details
  • ISBN-13: 9780217678353
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 34
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 0217678351
  • Publisher Date: 18 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr


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