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Quiz_6_Sol - BME 311 Circuit Analysis for Biomedical...

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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 [Wot-VENJJ 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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