Natural Response of an RL circuit

Discussion in 'Homework Help' started by jstrike21, Oct 14, 2009.

  1. jstrike21

    Thread Starter Member

    Sep 24, 2009
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    On the first problem in the attached pdf, wouldn't Vo(0-) and Vo(0+) be zero due to the inductor acting as a short?
     
  2. ELECTRONERD

    Senior Member

    May 26, 2009
    1,146
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    In terms of resistance, yes, I would say that you're correct. However, inductors do have a negligible amount of resistance that you can ignore, but that certainly doesn't change the inductance. It's still there.
     
  3. Thav

    Member

    Oct 13, 2009
    82
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    You can only say an inductor acts as a short to DC current. At t=0 there is a transient event in which case the inductor is most decidedly not a short.

    The current in an inductor can not change instantaneously. So at t=0+ the current inductor must be the same as it was at t=0-. Where does that current have to flow to complete the circuit? What can you then tell about the voltage across the inductor?
     
  4. ELECTRONERD

    Senior Member

    May 26, 2009
    1,146
    16
    That makes perfect sense.
     
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