Help with Series RLC circuit

Discussion in 'Homework Help' started by wiz0r, Nov 20, 2011.

  1. wiz0r

    Thread Starter Active Member

    May 2, 2008
    64
    0
    Edited for assignment purposes...
     
    • ex2.png
      ex2.png
      File size:
      111.6 KB
      Views:
      15
    Last edited: Nov 20, 2011
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Write the KVL differential equation form for the simple series loop comprising the capacitor, inductor and two 60Ω resistors. Use the voltage on 1mF C at t=0 as the initial condition and decide what the current will be at t=∞. You've correctly stated that i(0+)=0.

    Then solve the differential equation per standard methods to find i(t).
     
    wiz0r likes this.
  3. wiz0r

    Thread Starter Active Member

    May 2, 2008
    64
    0
    Edited for assignment purposes...
     
    Last edited: Nov 20, 2011
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Looks fine so far.
     
    wiz0r likes this.
  5. wiz0r

    Thread Starter Active Member

    May 2, 2008
    64
    0
    Edited for assignment purposes...
     
    Last edited: Nov 20, 2011
  6. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Correct - but I'm tired of holding your hand.
     
    wiz0r likes this.
  7. wiz0r

    Thread Starter Active Member

    May 2, 2008
    64
    0
    Edited for assignment purposes...

    PS: I'm really thankful for all your help... :)
     
    Last edited: Nov 20, 2011
  8. wiz0r

    Thread Starter Active Member

    May 2, 2008
    64
    0
    After several headaches and the help of others I found out that:

    i(t) = 0.388e^(-10.73 * t) + -0.388e^(-37.26 * t)

    Woohoo.. topic closed..
     
  9. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    This thread will certainly help those who come along in 6 months asking the same question. :rolleyes:
     
  10. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Presumably Wiz0r doesn't want their circuit theory teacher too easily deducing they were receiving help online.
     
Loading...