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: Current formula question

  1. May 4, 2008 #1
    I know I(t) = Io [1 - e-t/t ] is the formula to calculate the current in an RL circuit, however i have no clue what "e" stands for. Can someone give me an insight?
  2. jcsd
  3. May 4, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    e is the "en.wikipedia.org/wiki/Exponential_function"[/URL]: here, it means [itex]\mathrm{exp}(-t/\tau)[/itex], where [itex]t[/itex] is time and [itex]\tau[/itex] is a characteristic time constant.
    Last edited by a moderator: Apr 23, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook