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What is scientific reason behind skin effect of conductors?

  1. Jul 8, 2011 #1
    What is scientific reason behind skin effect of conductors?
     
  2. jcsd
  3. Jul 8, 2011 #2

    berkeman

    User Avatar

    Staff: Mentor

    Let us know if you still have specific questions after reading this introductory article:

    http://en.wikipedia.org/wiki/Skin_effect

    .
     
  4. Jul 13, 2011 #3
    The AC current density J in a conductor decreases exponentially from its value at the surface JS according to the depth d from the surface, as follows:

    where δ is called the skin depth. The skin depth is thus defined as the depth below the surface of the conductor at which the current density has fallen to 1/e (about 0.37) of JS. In normal cases it is well approximated as:
    .
    where
    ρ = resistivity of the conductor
    ω = angular frequency of current = 2π × frequency
    μ = absolute magnetic permeability of the conductor

    courtesy from wikipedia
    how these equations came from?
     
  5. Jul 13, 2011 #4
    The AC current density J in a conductor decreases exponentially from its value at the surface JS according to the depth d from the surface, as follows:

    where δ is called the skin depth. The skin depth is thus defined as the depth below the surface of the conductor at which the current density has fallen to 1/e (about 0.37) of JS. In normal cases it is well approximated as:
    .
    where
    ρ = resistivity of the conductor
    ω = angular frequency of current = 2π × frequency
    μ = absolute magnetic permeability of the conductor

    courtesy from wikipedia
    how these equations came from?
     
  6. Jul 13, 2011 #5
    But actually the inductance L increases hence current decreases,
    then why the ac 'resistance' is calculated as
    Rac =1.6*Rdc ?
    &
    what happens to the power factor?
     
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