# Total impedance of rl circuit

1. ### eng_stud

14
1. The problem statement, all variables and given/known data
find total impedance of a circuit with R1 and L in parallel with R2.

circuit looks like this (but with R2 instead of C): http://wpcontent.answcdn.com/wikipe...rallel.svg/160px-RL_series_C_parallel.svg.png

2. Relevant equations
formula for two components in parallel: $$Z_T = Z_1 Z_2/(Z1 + Z_2)$$

3. The attempt at a solution
question is, can I first combine the two resistors in parallel, then add the inductor in series? Or must I do the inductor and R1 together, in parallel with R2? So, eith er R1||R2 + Z_L or (R1+Z_L)||R2 ?

I'm assuming the last one?

2. ### vela

12,561
Staff Emeritus
Yes, the latter.