Lightbolb A is marked w 120 w,\" and lightbulb B is marked w 120 v,\" These labe

Question

Lightbolb A is marked w 120 w," and lightbulb B is marked w 120 v," These labels mean that each lightbulb has its respective power delivered to when it is connected to a constant 120.v source. (a) Find the resistance of each lightbulb. R_A = ohm R_B = Ohm (b) During what time interval does c pass into lightbulb A? (C) Is this change different upon its exit versus the entry into the lightbulb? Yes No Explain. (d) In what time interval does pass into lightbulb A? s (e) By what mechanisms does this energy enter and exit the lightbulb? Explain.

Explanation / Answer

a) Ra = V^2/power = 120*120/15 = 960 Ohms

Rb = 120*120/100 = 144 Ohms

b) I = Power/V = 15/120 = 0.125 A

=> Q = I*T => T = 1.8/0.125 = 14.4 sec

C) No, because current in one branch remain same. Because of charge conservation there is no other path for charges to go.

d) T = Energy /Power = 1.6/15 = 0.1067 sec Answer

e) Kinetic energy of moving electrons is converted into heat and light energy produced by bulb.

f) Total w = 15*60*60*24*30 = 38880 KWh

=> cost = 38880*0.11 = $4276.8 Answer

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