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RLC Circuit problem.

  1. Dec 16, 2007 #1
    RLC Circuit problem. Please Help!

    1. The problem statement, all variables and given/known data

    In the figure, what is the current supplied by the emf when the frequency is very small?

    What is the current supplied by the emf when the frequency is very large?
    [​IMG]



    2. Relevant equations


    I am not sure but:

    wo=1/sqrt(LC)

    Vr=IR

    Vl=IXl

    Vc=IXc
     
  2. jcsd
  3. Dec 16, 2007 #2

    rl.bhat

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    When the frequency is very small. XL = 2*pi*f*L is nearly zero and XC = 1/2*pi*f*C is near open circuit, and most of the current will flow through inductor branch
    When the frequency is very high. XL = 2*pi*f*L very high and XC = 1/2*pi*f*C is near zero and most of the current will flow through capacitor branch.
     
  4. Dec 16, 2007 #3

    nicksauce

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    Science Advisor
    Homework Helper

    For high enough frequencies you can replace the inductor with an open circuit, and replace the capacitor with a short circuit. For low enough frequencies you can replace the inductor with a short circuit and the capacitor with an open circuit.
     
  5. Dec 16, 2007 #4
    Thank You!

    I am pretty sure I will be able to get it now.
     
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