Conceptual Laplace Transform Question

Discussion in 'Homework Help' started by jegues, Feb 27, 2011.

  1. jegues

    Thread Starter Well-Known Member

    Sep 13, 2010
    735
    43
    Hello everyone, I've just got a quick conceptual question regarding solving circuits using the laplace transform.

    See figure.

    As my textbook shows, there are two possible transformations of an inductor and/or a capacitor into the frequency domain. One with the impeadance in series with the initial condition voltage source, the other in parallel with the initial condition current etc...

    My question is, how do I know which one to pick, and why? Is there certain cases where one representation will simplify the work much more than the other representation? How do I distinguish this?

    Thanks again!
     
  2. Heavydoody

    Active Member

    Jul 31, 2009
    140
    11
    I think you will find that, generally speaking, the current source model faciltates solving via nodal analysis, while the voltage source model works best with mesh. But each circuit requires inspection to determine which will work best.
     
  3. jegues

    Thread Starter Well-Known Member

    Sep 13, 2010
    735
    43
    Is there anything in specific that I should be looking for in a circuit that will lean towards one representation rather than the other?
     
  4. Heavydoody

    Active Member

    Jul 31, 2009
    140
    11
    Count the number of mesh loops and nodes; whichever is less, that is probably the best method (assuming no other simplifications or methods are available).
     
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