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RLC cricuit

  1. May 21, 2017 #1
    1. The problem statement, all variables and given/known data
    what is the value combined impedance of the parallel circuit ?when R=25 ,X[c]=100 and X[L]=25

    2. Relevant equations
    I think we use this equation to solve parallel impedance .... acp176.gif .

    3. The attempt at a solution
    z=1/√((squ(1/25))+(squ((1/25)-(1/100))))=1/√(1/625)+squ(3/100)=√10000/25=100/5=20
    but the ans is given is 120 what I do ???
     
  2. jcsd
  3. May 21, 2017 #2
    Hi,
    with your value(R=25,XL=25,XC=100) and your equation you found the right answer. Maybe you forget to convert L and C value to phasor form, it means ( XL=JwL not XL= L) or the book answer is wrong
     
  4. May 21, 2017 #3
    no its is given the value of Xc and XL ......... no need to find Xc and XL
    vetre
     
  5. May 21, 2017 #4

    cnh1995

    User Avatar
    Homework Helper

    Perhaps it is a typo. The answer is j20, not 120.
    The equivalent impedance of a bunch of parallel impedances is less than the least of them, which means the answer is less than 25.
     
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