Capacitors, Inductors and Transient Circuits

Discussion in 'Homework Help' started by Alustriel, May 24, 2009.

  1. Alustriel

    Thread Starter Member

    Apr 1, 2009
    14
    0
    We're just entered this part of the book in our electric course. The thing is, I've read through the whole text book and even the information on this website and I still don't understand a thing. :( Here are some of the easier examples from the book, I hope you guys can guide me along the way as I try to master capacitance, inductance and transient circuits. :)

    *Solved* Will be updating with other questions soon, stay tuned :D
     
    Last edited: May 25, 2009
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Q1 1.67 mF is right

    Q2 Remember 1/Z=1/R+1/(jωL)+jωC so for Z to be real the terms in 'j' must vanish or reduce to zero.

    Q3 The total stored energy at steady state = Inductor energy + Capacitor energy. At steady state the source current will divide between R1 & R2 and C will have charged to its final value. The voltage across R1 (and / or R1 || R2) at steady state will equal the capacitor voltage. For the purposes of analysis at steady state consider C as an open circuit and L as short circuit.

    Q4 Before t=0 the inductor will be "charged" with a certain current. When the switch opens the current can only flow around the L || R1 loop. That loop will decide the time constant after t=0.
     
  3. Alustriel

    Thread Starter Member

    Apr 1, 2009
    14
    0
    Hey thanks, managed to solve em all :p
     
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