1. Not finding help here? Sign up for a free 30min 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!

Revision question

  1. Jul 29, 2005 #1
    hi okay i have a question, it is an old test question so it would be nice is someone ans b4 8am cos that is when the test it but if not that is fine just incase someone is surfing this website at this time.. ha.n e ways the question is a 25mH inductor is connected in series with a 20ohm resisto thru a 15v power supply and a swiitch. if the switch is closed at t= 0 what is the current at t = 7 the ans is 750 but do not know how was derived. thks.
  2. jcsd
  3. Jul 29, 2005 #2


    User Avatar
    Homework Helper

    Show me your efforts
  4. Jul 29, 2005 #3


    User Avatar
    Homework Helper

    What is the current when t=0?
    What is the current when t=infinity?
    if i(0)<i(7)<i(infinity)
    Where in this range do you expect i(7) to be?
    What is i'(7)?
    How does i(t) evolve over time?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Revision question
  1. 2D Motion Revision (Replies: 3)