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Inductance problem

  1. Dec 4, 2013 #1

    dwn

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    1. The problem statement, all variables and given/known data

    An inductor has an inductance of 0.45 H and internal resistance of 2.5 . If the H
    inductor is connected to a 120-V (rms) source at 60 Hz, what is the current (rms) through
    it?

    2. Relevant equations

    XL=2pi*f*L
    V=IR

    3. The attempt at a solution

    I don't have any idea and my brain is wrecked! I'm having a difficult time finding this bridge.
     
  2. jcsd
  3. Dec 4, 2013 #2
    You don't want to use V=IR, that doesn't take into account the reactance of your inductor. For a simple LR circuit V=IZ.
     
  4. Dec 4, 2013 #3

    dwn

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    Even using Z, I still arrive at 48 A. 120/2.5 = 48 A Which is not the correct answer. It is .7 A.
     
    Last edited: Dec 4, 2013
  5. Dec 4, 2013 #4
    I get I = 0.707 A.
     
  6. Dec 4, 2013 #5
    Z≠2.5Ω.
     
  7. Dec 5, 2013 #6

    NascentOxygen

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    Staff: Mentor

    How do you determine the impedance of a series circuit of 0.45 H in series with a resistance of 2.5Ω ? You have studied complex number arithmetic?
     
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