total impedance of rl circuit

eng_stud

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/wikiped...rallel.svg.png

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


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?

vela

Yes, the latter.

sanadan

The two series impedances are both, as a combined single impedance, in parallel with the last impedance. That is why vela and yourself are both correct.