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: Current in terms of Voltage

  1. Feb 7, 2009 #1
    I'm having a bit of trouble getting the right answer for a problem in my electrical engineering textbook. The question is:

    At t=0, the current flowing in a 0.6H inductance is 8A. What constant voltage must be applied to reduce the current to 0A at t=0.4s.

    I'm using the equation:

    [tex]i(t)=\frac{1}{L}\int\ v(t).dt+i(t_{0})[/tex] with limits 0.4s and 0s

    The answer i'm getting is 12V, and the book says 10V.. which is right??

    I'm using L=0.6H, i(t0)=8A, and i(t)=0A

    Please help!
     
  2. jcsd
  3. Feb 8, 2009 #2

    CEL

    User Avatar

    It seems the book answer is wrong. And so is yours. The correct answer would be -12V.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook