9/1/2018 11:59 PM A 66.2/100 20 of 24 University Science Books presented by Sapl
ID: 713862 • Letter: 9
Question
9/1/2018 11:59 PM A 66.2/100 20 of 24 University Science Books presented by Sapling Learning General Chemistry 4th Edition In a certain city, electricity costs $0.19 per kW h. What is the annual cost for electricity to power a lamp- post for 5.50 hours per day with (a) a 100.-watt incandescent light bulb (b) an energy efficient 25 watt scent bulb that produces the same amount of light? Assume 1 year 365 days (a) 100-watt bulb (b) 25-watt bulb Number c) A typical incandescent bulb costs $0.89 and lasts for about a year; a costs about $3.49 and lasts for about 3 years. Is the O yes no Previcous G Ue& Viw Solution O Check Answer NextExExplanation / Answer
a)
Answer
$ 38.14
Explanation
1kW. h = 3.6MJ
Cost of 3.6MJ = $0.19
Total running time of bulb =( 5.50hr/1day) × 365day =2007.5hr = 7227000s
Power of bulb = 100watt = 100J/s
Total energy consumed per year = 100J/s × 7227000s = 722700000J
Cost of power per year =( $0.19/3600000J)×722700000J = $38.14
b)
Answer
$ 9.54
Explanation
power of bulb = 25 watt = 25J/s
Total energy consumed per year = 25J/s × 7227000s = 180675000J
Cost of power per year =($0.19/3600000J)×180675000J = $9.54
c)
Answer
yes
Explanation
Total cast of incandescent bulb = $0.89 + ( 1year × $38.14/year) = $39.03
cost per year for incandescent bulb = $39.03
Total cast of fluorescent lamp = $3.49 + ( 3year + $9.54/year) = $32.11
cost per year for florescent lamp = $32.11 /3 = $10.70
per year cost for flourescent lamp is lower than the per year cost incandescent lamp.
Therefore
additional cost of flourescent lamp justified
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