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a) In the ENGR lab, there are 75 long light bulbs (P=100 W) and 6 regular bulbs

ID: 1277540 • Letter: A

Question

a) In the ENGR lab, there are 75 long light bulbs (P=100 W) and 6 regular bulbs (P=60 W). How much energy is consumed lighting the lab during the 3 lab periods (9hours). Calculate the amount of energy saved if all bulbs are replaced by CFL (spiral) bulbs (P=25W)

(b) Continuing from (a), calculate the amount of natural gas (ft3) needed to provide the energy to keep the lights (long + regular) in the lab on overnight for a month (10 hours per day for 30 days)? In other words, how much extra energy (in terms of cubic feet of natural gas) does the facility have to purchase when we don

Explanation / Answer

apply power = energy/time

so eenrgy U = Pt

U = 25* 9*60*60

U = 810 KJoules

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