1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Inductance problem

  1. Dec 4, 2013 #1


    User Avatar

    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

    2. Relevant equations


    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


    User Avatar

    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
  7. Dec 5, 2013 #6


    User Avatar

    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?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted