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RC Circuits and maximum voltage calculation

  1. Feb 18, 2008 #1
    [SOLVED] RC Circuits

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

    1. I have two questions in regards to RC circuits, the first one is how to calculate the maximum voltage across a capacitor, knowing the charge on a battery and the capacitance.

    2. The other question involves this circuit [​IMG]

    where the potential drop across the capacitor is 12V and the Battery is 36 V. R and C are also known. I need to calculate the current in R immediately after the switch is closed.



    2. Relevant equations

    For the first problem I am sure I am just overlooking something. As far as I know I can't use the equation V = Q/C as that will just give me the Voltage of the battery.





    3. The attempt at a solution

    In the second problem, I applied Kirchhoff's Law to obtain -I(1)*R(1)-12V+36V=0, where I then solve for I(1), but my answer in not correct, and I am not sure what I am doing wrong.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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