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Electrical Instruments and Testing

Electrical Instruments and Testing


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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. 1913 Excerpt: ...be as in Fig. 73. It will be seen from this diagram that the circuit starting downwards from the slab runs through the + battery post, battery cell, battery key B a, rheostat blocks, galvanometer, galvanometer key G a, to the main post and to the upper part of resistance slab. The slab, galvanometer and battery will thus be in series when B a and G a are depressed. If any plugs have been left out in the rheostat, the resistance of the coils they control will also be included in the circuit. When B a and G a are depressed a deflection of the galvanometer will ensue. If this deflection is: one degree, the constant is 100,000 ohms. If more than 1 degree, remove plugs from rheostat and add resistance thereby interpolated to resistance of slab. The constant will be the figure so obtained. And if less than one degree, a lower resistance than 100,000 ohms must be used, but it is not likely that this will be the case. The constant having been obtained, detach slab and connect resistance or insulation to be measured in its place. If the deflection is too small add more cells. A larger battery can be added by connecting it to the battery posts, detaching the flexible cords and cups from the battery in the case. To determine the resistance now being measured, divide the constant by the deflections obtained and multiply the result by the number of cells used. For example, let the deflection be 10 with 5 100,000 x 5 nnn, cells. = 50,000 ohms. The deflection has been increased 10 times, which would show that the resistance was only onctenth of the constant or 10,000 ohms. But as five times the e.m.f. has been used, the result must be multiplied by five. Another method is to use the deflection obtained through 100,000 ohms as the constant. Divide this constant by the defl...


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Product Details
  • ISBN-13: 9781236225764
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 48
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1236225767
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 104 gr


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