1. The problem statement, all variables and given/known data We have a resistor R1 in series with a capacitor C1, then we have a capacitor C2 in parallel with a resistor R2 I dont want to achieve the whole question, just the start as it is confusing me. 2. Relevant equations 1/Rz = 1/r1+1/r2 (parallel) 3. The attempt at a solution Total Impedance of the circuit= (R1+Jwc1)+ (R2//C2) Zt = (R1+jwc1)+(1/(1/R2+1/jwc) I am presuming 1/zt = 1/r1+1/jwc zt = (R1+jwc1)+(1/(1/R2+1/jwc) zt = (R1+jwc1)+(R2/(1+jwc2R2) This is as far as I want to go. I believe all is right so far. If not please let me know. My question starts with zt = (R1+jwc1) I thought (R1-jwc1) would be correct. What I mean is -Jwc or +1/jwc. Could anyone enlighten me? See below to for more information if necessary from a previous question.