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Electrical Engineering Laboratory Experiments

Electrical Engineering Laboratory Experiments


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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. 1919 Excerpt: ...when in use. Typical curves of candle power, current and watts per candle power are plotted for a tungsten lamp against hours burnt in Fig. 49. The curves for a carbon filament lamp are similar. Both carbon and tungsten-filament lamps show a rise in candle power or intensity for the first 50 or 60 hours of their life. Their intensity then declines CKaracterUttc Curves, of a 40-watt Vacuum Tungsten Lamfe. at a nearly uniform rate to the end of their useful life, which is from 600 to 1000 hours according to the type of lamp and the voltage at which it is operated. The decrease in luminous intensity of a tungsten-filament lamp burning at normal voltage is about 10 per cent. in eight hundred hours. The rate of decline in the luminous intensityi of a carbon-filament lamp in six hundred hours is usually nearly 20 per cent. The rate of decline in intensity decreases rapidly as the operating voltage is decreased. It follows that a tungsten filament lamp may be operated for about 20 hours at normal voltage or a longer time at reduced voltage without a change in luminous intensity of more than one-quarter of one per cent. All incandescent lamps which are to be used as secondary standards should be carefully annealed by operating at a reduced voltage for a hundred hours or more. The change in luminous intensity of an incandescent lamp with voltage is given approximately by V where I and I' are respectively the intensities at normal voltage, V, and at some other voltage, V. The exponent n varies from about 6.9 for the untreated carbon-filament lamp to about 3.6 for the tungsten-filament lamp. The approximate changes in luminous intensity for increases in voltage of two and five per cent. above normal are given for carbon and tungsten-filament lamps in the following tabl..


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Product Details
  • ISBN-13: 9781231190838
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 64
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1231190833
  • Publisher Date: 10 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 132 gr


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