1. The problem statement, all variables and given/known data Find the impedance (Z) of the circuit in the shown figure (R and L in series, and C in parallel with them). A circuit is said to be in resonance if Z is real, find ω in terms of R, L, and C? 2. Relevant equations VR= RIeiωt VL= LiωIeiωt VC= (Ieiωt)/(iωc) What I mean by I is I (not) H didn't know how to write it and i imaginary number, I hope the I wrote the equations clearly. 3. The attempt at a solution What I think about is: 1. Find Z. 2. Put Z in term of x+iy. 3. If Z is real then y=0. 4. find ω from y=0. If that correct I should find Z, but I'm not sure about it. first I found Zseries for R & L = R+iωL then Z = Zseries || ZC Am I right? or there are some specific formulas as if all R, L & C are in series?