AC circuits - inductors and resistors

Discussion in 'General Electronics Chat' started by xxxyyy, May 1, 2012.

  1. xxxyyy

    Thread Starter Member

    Oct 7, 2011
    34
    1
    Hi!
    Is there any tutorial about solving AC circuit which contains both resistors and inductors using kirchhoff laws?
     
  2. bretm

    Member

    Feb 6, 2012
    152
    24
    The Kirchhoff analysis would be the same as if the inductors were replaced by resistors with resistance equal to their AC impedance (assuming their DC resistance is negligible). Impedance for an inductor is the inductance in henries multiplied by the angular frequency. The angular frequency is 2 pi times the AC frequency.

    The AAC ebook gives an example at http://www.allaboutcircuits.com/vol_2/chpt_3/3.html
     
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  3. xxxyyy

    Thread Starter Member

    Oct 7, 2011
    34
    1
    Thanks a lot!
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,006
    3,232
    That only works if the circuit contains only inductors and no resistors. If it contains resistors also then you have to do a complex impedance calculation to account for the phase shift caused by the inductors. That is shown in the reference you posted.
     
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  5. xxxyyy

    Thread Starter Member

    Oct 7, 2011
    34
    1
    I have done few examples and I think I understand it. But if circuit has few voltage sources which have different frequencies, how should I solve that circuit? I guess that superposition theorem should do job?
     
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