du 3G 5:14 AM 6796 D + HW2 summer 2017 Halliday, Fundamentals of Physics, 10 Cha
ID: 1642765 • Letter: D
Question
du 3G 5:14 AM 6796 D + HW2 summer 2017 Halliday, Fundamentals of Physics, 10 Chapter 26, Problem 049 A 120 W lightbulb is plugged into a standard 120 V outlet. (a) How much does it cost in dollars per 31-day month to leave the light turned on continuously? Assume electrical energy costs US$ 0.06/kW·h, (b) what is the resistance of the bulb? (c) What is the current in the bulb? e) Number (b) Number (c) Number Click if you would like to Show Work for this question: Units Units n Show Warks Question Attempts: of 1 usedSVE OR LATERET ANS CoeyrVt © 2000-2017 by her, wiry &Sor;, Inc. or relatedcoroaies. Allryts reserveExplanation / Answer
A.
31 day = 31*24 = 744 hrs
Power used = 744*120 W-hr = 89280 W-hr
Power used = 89.280 kW-hr
Cost = 89.280 kW-.hr*$0.06 /kW-hr
Cost = 5.3568 Dollars
B.
P = V^2/R
R = 120^2/120 = 120 ohm
C.
V = i*R
i = V/R = 120/120 = 1 amp.
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