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!

Find the value of a capacitor given percent of the initial value

  1. Apr 23, 2013 #1
    1. The problem statement, all variables and given/known data

    A capacitor is discharged through an 80.0 ohm resistor. The discharge current decreases to 23.0% of its initial value in 1.50ms .

    What is the value of the capacitor?

    2. Relevant equations

    t=RC

    3. The attempt at a solution

    1500 μs = 0.23 RC
    RC= 6521.74

    C= 6521.74/R

    C= 6521.74/80 = 81.5 μF


    This is not correct... Please help! It's due within the next thirty minutes!
     
  2. jcsd
  3. Apr 24, 2013 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    The voltage vs time graph is not linear.
    $$v(t)=V_0e^{-t/RC}$$
     
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: Find the value of a capacitor given percent of the initial value
  1. Initial value problem (Replies: 3)

  2. Initial value problem (Replies: 8)

  3. Initial Values (Replies: 1)

Loading...