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Find the total saving in electrical load and percentage increase in illumination if instead of using twelve 150 W tungsten-filament lamps, we use twelve 80 W fluorescent tubes. It may be assumed that (i) there is a choke loss of 25 per cent of rated lamp wattage (ii) average luminous efficiency throughout life foreach lamp is 15 lm/W and for each tube 40 lm/W and (iii) coefficient of utilization remains the same in both cases

Find the total saving in electrical load and percentage increase in illumination if instead of using twelve 150 W tungsten-filament lamps, we use twelve 80 W fluorescent tubes. It may be assumed that (i) there is a choke loss of 25 per cent of rated lamp wattage (ii) average luminous efficiency throughout life foreach lamp is 15 lm/W and for each tube 40 lm/W and (iii) coefficient of utilization remains the same in both cases

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Find the total saving in electrical load and percentage increase in illumination if instead of using twelve 150 W tungsten-filament lamps, we use twelve 80 W fluorescent tubes. It may be assumed that

(i) there is a choke loss of 25 per cent of rated lamp wattage

(ii) average luminous efficiency throughout life foreach lamp is 15 lm/W and for each tube 40 lm/W and

(iii) coefficient of utilization remains the same in both cases

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