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Homework Help: Frequency Response Circuit

  1. Oct 11, 2016 #1
    1. The problem statement, all variables and given/known data
    Screen Shot 2016-10-11 at 7.57.38 PM.png

    2. Relevant equations
    H(w) = Y/F = Impedance of circuit

    3. The attempt at a solution

    I wanted to simplify this circuit before I find any impedance, but I am not sure if I did my source transformation correctly. Can i combine the f(t) current source with the 1ohm in parallel even though there is another resistor in series with it? Or are my steps correct?

    New Doc 30_1.jpg
  2. jcsd
  3. Oct 11, 2016 #2


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    Staff: Mentor

    A resistor (or any passive component) in series with a current source has no effect outside of altering the potential differences on components within the current source branch. The branch will still deliver the current source's specified current with or without series resistance in the way; the current source will just alter its own potential difference to compensate and maintain the current.

    What this means is that you can remove that series resistor entirely without making any change to the way the rest of the circuit operates.
  4. Oct 11, 2016 #3
    So do I just ignore that resistor from the start or do I have to include it like I did in my source transformation?
  5. Oct 11, 2016 #4


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    Staff: Mentor

    Remove it. Erase it. Obliterate it. Pretend it never exited :smile::biggrin:
  6. Oct 11, 2016 #5
    Lol.. Thanks! :smile:
  7. Oct 15, 2016 #6

    rude man

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    Homework Helper
    Gold Member

    How did your second 1 ohm reisstor wind up in series with the L-C network?
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