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Find Energy stored in System of capacitors

  1. Oct 17, 2009 #1
    1. The problem statement, all variables and given/known data
    I have a system of capacitors set up in a combination of parallel and series connections. The first question(part a) asks me to find the total capacitance of the combination. The second question(part b) asks me to find the total energy stored in the system of capacitors.

    They give me all the capacitances of each capacitor in the combination as well as the emf voltage.

    So I got part A, no problem.

    I think I did part B right but I just want to make sure I'm not oversimplifying things.

    2. Relevant equations
    Basically to find the total energy stored in the system, I used the equation U = (1/2)CV^2. I plugged in the value I found for part A into C, and used the given emf voltage.

    (from part A) C = .75uF
    (given emf) V = 1V

    3. The attempt at a solution
    So plugging those values into the equation, I got U = .375 uJ as my answer.

    Now I am just wondering, is that all I do? At first I thought that maybe I had to figure out the energy stored for every capacitor individually, then add it all up... but after a while it just occurred to me to use the above equation for U.

    I feel that I am correct, but I'm just hoping I can get some confirmation, or some help if I am wrong?

    Thanks guys!
    Last edited: Oct 17, 2009
  2. jcsd
  3. Oct 17, 2009 #2


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    Homework Helper

    Hi silkyjojnson, welcome to PF.
    Your answer is correct.
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