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: Energy stored on a capacitor

  1. Aug 19, 2007 #1
    1. The problem statement, all variables and given/known data
    Express the energy stored on a capacitor in terms of L, R, V in a standard LRC circuit. The circuit is at resonance.

    2. Relevant equations
    E = 1/2 CV^2

    3. The attempt at a solution
    Well I start with substituting C with something else.
    1) C = 1/(Lw^2)
    So E = 1/2 V^2/(Lw^2)

    2) That's where I begin to have problems. I've then tried w = 2pi*f and f = R/L

    Therefore E = V^2 * L /(2R^2 * 4pi^2). Unfortunately, I'm close to the answer but the 4pi^2 term is where my problem lies. Anyone know where I went wrong?
  2. jcsd
  3. Aug 19, 2007 #2
    Cancel that, I figured it out
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook