Explanation Given: Cost of incandescent bulbs = C i b = $ 1.50 Time of use of each bulb each day = n h = 8 h Number of days each bulb is used = n d = 365 days Time of use of each bulb = t Lifetime of each incandescent bulb = t i b = 1000 h Number of incandescent bulbs used = n i b Cost of using incandescent bulbs each year = C i b t Cost of energy per unit = c = $ 0.100 /kWh − 1 Total energy consumed by incandescent bulbs = E i b Cost of compact fluorescent bulbs = C c f = $ 6 Lifetime of each compact fluorescent bulbs = t c f = 10000 h Number of compact fluorescent bulbs used = n c f Cost of using compact fluorescent bulbs each year = C c f t Total energy consumed by fluorescent bulbs = E c f Saving = S Formula Used: Total duration of usage is given as time of usage = (number of usage)(number of hours) Number of bulbs used is given as n = Duration of usage Duration of Lifetime Cost of using a bulb is given as Total Cost = (Cost of each bulb) (number of bulbs) + (Energy consumed)(cost per unit) Calculation: Total duration of usage of each bulb is given as t = n h n d t = ( 8 ) ( 365 ) t = 2920 h For incandescent bulbs: Number of incandescent bulbs used is given as n i b = t t i b n i b = 2920 1000 n i b = 3 Total energy consumed by incandescent bulbs is used as E i b = P i b t E i b = ( 75 ) ( 2920 ) E i b = 219000 Wh E i b = 219 KWh Total cost of using incandescent bulbs is given as C i b t = ( C i b )( n i b ) + ( E i b )(c) C i b t = ( $ 1

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ISBN: 9781429281843

Author: Tipler

Publisher: MAC HIGHER

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Chapter 25, Problem 28P

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The amount of money saved by using compact fluorescent lightbulbs

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Chapter 25, Problem 29P

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