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Total impedance of rl circuit

  1. Dec 30, 2010 #1
    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: [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?
  2. jcsd
  3. Dec 30, 2010 #2


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    Yes, the latter.
  4. Dec 31, 2010 #3
    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.
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