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Is AC Rs include DC RS?

JAy
Prodigy 80 points

Hi 

As I know,

Rp = L / ( Rs*C) 

I have Tow Questions. 

First is,

Is AC Resistance Calculate on Resonance Frequency?

And Second is, 

( AC Resistance includes DC Resistance Normally, But I Wonder about LDC Case. Is It Same with normal AC Resistance calculation?)

If My inductor is 10uH, and Sensor capacitor is 330pF And, DC Resistance is 3 ohm,

Resonance frequency is 2.77Mhz.

So , I Can XL and XC form theos values.

XL is 2 * 3.14 * 2.77M * 10u = 174 

XC is 1/ ( 2 * 3.14 * 2.77M * 330p ) =  174

Then, Is AC Rs Include DC Rs? OR Just only Reactance?

Could you tell me What value is collect please?

:-)

  • 0
    TI__Genius 14270 points
    Hi User.

    The AC resistance is not the XL and XC added to the DC Resistance. It is the actual resistance at a specific frequency. One of the main factors which drives the AC resistance is skin effect, which is the preference of AC currents to travel on the surface of conductors. As the frequency increases, the current travels in a shallower ring on the surface of conductors. As the shallower ring has a smaller cross-sectional area, the effective resistance increases.

    Regards,

    ChrisO
  • 0 in reply to Chris Oberhauser66
    Prodigy 80 points
    Thanks for your fast help.
    But I wonder,
    XC and XL is same on the Resonace Frequency.
    As I know, Resonance Frequencyu is F_sensor.
    Then,
    AC Rs = Dc Rs
    because,
    XL - XC = 0

    So maybe I think AC Rs is meaning skin effect resistance you told me.
    Ok. I need to find about skin effect resistance.

    Thanks!!

    Best Regards
    Jay