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?