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Homework Help: Using Laplace to solve circuit analysis

  1. Apr 19, 2017 #1
    1. The problem statement, all variables and given/known data

    3. The attempt at a solution

    As you can see, the answer is given in the problem. I have the 0.8t par right but somewhere along the way I messed up. I'm not really to sure about how to solve these types of problems using Laplace. Is there a general procedure that I should be following that I am not?
  2. jcsd
  3. Apr 19, 2017 #2


    User Avatar

    Staff: Mentor

    The Laplace transform of a DC source is V/s. Essentially it's modeled as a step function, "turning on" at time t = 0. So your 12 V source should be 12/s.

    The voltage that represents the stored energy due to the initial current (your 30 V supply) needs to have its polarity reflect the actual direction of that initial current.

    Otherwise you seem to be doing okay.
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