Unformatted text preview: BME 311 Circuit Analysis for Biomedical Engineering Quiz #6 Name: Score: k E i 1. (15 points) A BME 311 student designed the following circuit for an emergency room lightening system where the two light bulbs are represented by a 3 .Qresistor and an 8 Qtesistor, respectively.
The switch has been open for long time. At t=0, the switch Is closed. Please answer the
following question: (a) Before the switch is closed (t<0). what is the voltage v across the capacitor? What is the
current flowing through the 8 Qresistor? What is the current ﬂowing through the 3 {2
resistor? (5 points) (b) When the switch is closed at t=0, what is the voltage v across the capacitor at that
moment? (2 points) (c) After the switch is closed (t>0). how does the voltage v across the capacitor vary as a
function of time, that is, ﬁnd v(t). (4 points) (d) As tgoes to inﬁnity (the switch remains closed), what is the current ﬂowing through the 8
Q resistor? What is the voltage across the 3 .Q resistor? (4 points) l 1911 ::‘A}’, ‘4 e004) , t
cl 1):), um :lJU’O} t [WotVENJJ 6‘ ‘z 7 Liza #12:» Vim} : [2v W“ 3 ””53
V”) = 1w ‘dl t—vpo V1.» : O V ﬁpevl Civcuj't: a] April 22“", 2011 Page 1 of1 (c) John X.J. Zhang, UT Austin ...
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 Spring '08
 Zhang

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