A faculty administration wants to change all fluorescent lights in rooms, labs, and classrooms. There are 250 lambs. A regular bulb is 5 TL and a LED bulb is 45 TL. A regular bulb consumes 40 Watts electricity whereas a LED bulb consumes 6 Watts. If electricity price is 0.80 TL per kilowatt-hour, how many days later will LED bulbs be more economical. Assume average working time (of all bulbs) is 6 hours. Note that the time for average life of the bulbs is 3 years.

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter28: Current And Resistance
Section: Chapter Questions
Problem 62PQ
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A faculty administration wants to change all fluorescent lights in rooms, labs, and classrooms. There are 250 lambs. A regular bulb is 5 TL and a LED bulb is 45 TL. A regular bulb consumes 40 Watts electricity whereas a LED bulb consumes 6 Watts. If electricity price is 0.80 TL per kilowatt-hour, how many days later will LED bulbs be more economical. Assume average working time (of all bulbs) is 6 hours. Note that the time for average life of the bulbs is 3 years.

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