confused between impedance and reactance

Discussion in 'Math' started by PG1995, Dec 6, 2011.

  1. PG1995

    Thread Starter Active Member

    Apr 15, 2011
    753
    5
    Hi

    Please have have a look on this link to see my question, and Ref#1 is here. Please help me with the query. Thanks a lot

    Regards
    PG
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,534
    Reactance is frequency dependent, and unlike impedance dissipates no power. This is why AC fluorescent lights are so efficient, the ballast coil does not use energy while limiting current.

    Just curious, did you try Wikipedia. It is one of many friends out there.
     
  3. Papabravo

    Expert

    Feb 24, 2006
    10,135
    1,786
    Impedance is a complex quantity. It has a REAL part and an IMAGINARY part. The REAL part is called resistance and is not frequency dependent. The IMAGINARY part is called reactance and it is frequency dependent. The MAGNITUDE of the impedance is the square root of the sum of the squares of the REAL and IMAGINARY parts. The phase angle of the impedance is the arctangent of the IMAGINARYpart over the REAL part.

    http://en.wikipedia.org/wiki/Complex_number
     
  4. MrChips

    Moderator

    Oct 2, 2009
    12,415
    3,354
    Couldn't have said it any better.:)
     
    Papabravo likes this.
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