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Homework Help: Why is this RC circuit not working?

  1. Sep 9, 2010 #1
    Hello all!

    I am really stuck up here. I have made this circuit and want to measure the voltage across the capacitor. The voltage should gradually increase as the capacitor charges, and then become constant. But, I only get a constant voltage of 6V across the capacitor.

    Infact, I have to measure the time constant. I am doing a transient analysis, and when I plot the voltage, it just shows a straight line, and no rising trend.

    Please help!

    The circuit image can be seen at:

    http://img641.imageshack.us/img641/8897/rccircuit.jpg [Broken]
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Sep 9, 2010 #2


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    Gold Member

    Have you done voltage divider theory, and do you know how a capacitor 'see's' a DC supply?
  4. Sep 9, 2010 #3
    Thanks for the reply.

    I have solved the problem. I was not setting the initial condition of the capacitor to 0V.
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