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Homework Help: Finding R and C from a parallel RC circuit

  1. Mar 21, 2014 #1
    1. The problem statement, all variables and given/known data

    A RC parallel circuit with an impedance of Z = 105000 Ω ∠ -27 and frequency of 50 Hz.

    2. Relevant equations

    I need to find out what the R and C values using the information given.

    3. The attempt at a solution

    I know the impedance for a parallel RC can be calculated from

    1/Z = 1/R +jwc

    Z can be converted to Z = 9355.69 -j47669 but from there i am completely confused on what to do next.

    Any help will be much appreciated.
  2. jcsd
  3. Mar 21, 2014 #2
    Well you can calculate 1/Z and express it in a+jb form...Compare the real and imaginary parts then.
  4. Mar 21, 2014 #3
    If i do 1/z i would get,

    0.000008485 +j0.000004323

    but im still not sure where R and C would come from.
  5. Mar 21, 2014 #4


    User Avatar

    Staff: Mentor

    [scientific notation would help curtail all those zeros :smile:]

    Equate the terms of your expression above to the numerical values of the conductance components...
  6. Mar 21, 2014 #5
    I want to thank you both for your help.
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