1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: SPST switch RLC circuit help

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

    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

    User Avatar
    Homework Helper
    Gold Member

    Yes you did.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted