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!

Capacitance equations question

  1. Mar 30, 2007 #1
    1. The problem statement, all variables and given/known data

    A known voltage source V_0 is connected by a switch to two capacitors in series with capacitance C_1 and C_2. When we flip the switch, connecting the capacitors to the voltage source, we measure the voltage across each capacitor, V_1 and V_2 respectively.

    I need to derive an equation relating V_1 and V_2 in terms of V_0, C_1 and C_2

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 30, 2007 #2

    berkeman

    User Avatar

    Staff: Mentor

    What is the equation that relates charge Q on a capacitor to the capacitance C and the voltage V?
     
  4. Mar 30, 2007 #3
    It's V=Q/C.
     
  5. Mar 30, 2007 #4

    berkeman

    User Avatar

    Staff: Mentor

    Correct. Now do you know what the total capacitance is for two caps connected in series? If you know that, what can you say about the overall Q, since you know the V?
     
  6. Apr 2, 2007 #5
    Q = CV.

    In series,

    1/Ctotal = 1/C1 + 1/C2 + 1/C3 Etc.
     
  7. May 12, 2007 #6
    Answer for you

    :redface: In Series connection the the total potential difference is the sum of potential difference across each capacitor..so
    V_0=V_1 + V_2
    q=CV
    q/c_0=q/c_1 + q/c_2
    so
    c_0 = (c_1*c_2)/(c_1+c_2)
     
    Last edited: May 12, 2007
  8. May 12, 2007 #7
    Answer for you Superdave

    :redface: In Series connection the the total potential difference is the sum of potential difference across each capacitor..so
    V_0=V_1 + V_2
    q=CV
    q/c_0=q_1 + q_2
    so
    c_0 = (c_1*c_2)/(c_1+c_2)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Capacitance equations question
  1. Capacitance equation (Replies: 8)

  2. Capacitance Equations (Replies: 4)

  3. Capacitance question? (Replies: 3)

  4. Capacitance question (Replies: 1)

  5. Capacitance question (Replies: 11)

Loading...