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!

Circuit Analysis problem

  1. Sep 30, 2016 #1
    • ✱✱ member reminded to use the 3-header homework template provided ✱✱
    There is a question I am not sure of how I should start/approach. Any help would be appreciated, thanks.

    Vc(0)=3V and ic(t)=e^-50t for t>0 and t=0. Find the value of R and voltage v(t) for t>0 and t=0

    Attached Files:

  2. jcsd
  3. Sep 30, 2016 #2
    Apply Kirchhoff' Voltage rule in the two loops ,
    first in the loop with 2 ohm resis. and capacitor to find voltage
    and then in the loop with 2 resistors (R and 2 ohm) to find R !
  4. Sep 30, 2016 #3


    User Avatar

    Staff: Mentor

    I might start by examining the form of the capacitor current. There's a time constant that will have to involve the value of R in some way... Are you familiar with Thevenin equivalents? What resistance will the capacitor "see" when it's following ic(t)=e^-50t ? Can you disentangle R from that?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Discussions: Circuit Analysis problem