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SPST switch RLC circuit help

  1. Mar 28, 2013 #1
    1. The problem statement, all variables and given/known data
    do0wpd.png

    SPST switch closes at t=0. Find vC(0-) and iL(0-), iC(0) and vL(0), and vC(infinity) and iL(infinity).


    2. Relevant equations
    3. The attempt at a solution
    kind of basic circuit, i know, but i just wanted to check my answers in case i did something wrong.

    At t=0- : capacitor acts like open circuit, inductor like short circuit. also there no closed loops, so there's no current. vC(0-)=V(s)=12V, and iL(0-)=0.

    at t=0: capaciator behaves like voltage source, inductor like current source of 0A. so would iC(0) be -3A? and vL(0)=12V.

    at t=infinity: capacitor acts like open circuit, inductor like short circuit. vC(infinity)=0V, and iL(infinity)=4A.
     
  2. jcsd
  3. Mar 28, 2013 #2
    Looks right to me
     
  4. Mar 28, 2013 #3
    anyone else?? did i do this right?
     
  5. Mar 29, 2013 #4

    rude man

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    Gold Member

    Yes you did.
     
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