Finding the Req seen by the inductor

Discussion in 'Homework Help' started by de1337ed, Mar 14, 2012.

  1. de1337ed

    Thread Starter New Member

    Mar 6, 2011
    23
    0
    I'm having a little trouble finding equivalent resistances seen by certain energy storage devices. I have the following Problem:
    [​IMG]

    I want to find the equivalent resistance seen by the inductor, so I remade the circuit in the following fashion:
    [​IMG]

    From what it looked like to me, it seemed as though the two resistors are in parallel when seen by the inductor, and as a result, the Req = 9/4 Ω. (9Ω||3Ω).

    Is this correct? I need to use this value to calculate τ for my problem. Thank you.
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,415
    3,354
    Req for an inductor at DC is zero ohms.
     
  3. de1337ed

    Thread Starter New Member

    Mar 6, 2011
    23
    0
    I'm not trying to find the Req of the inductor, sorry for the misunderstanding. I'm trying to find the Req 'seen' by the inductor.
     
  4. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    Yes, your answer looks good to me.
     
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