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# [femm] Another AC analysis question

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- Subject: [femm] Another AC analysis question
- From: marctt2@aol.com
- Date: Wed, 10 Nov 1999 23:03:26 -0800
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    Maybe I'm missing something simple:

    I'm attempting to model a single-turn coil. I would like to get the AC
    inductance and resistance of this coil.

    I have made my coil out of copper wire. I set the necessary J in the
    coil to get 1 Amp in the coil (to make calculation of the inductance
    and resistance simpler).

    Now, when I use the solver to find stored energy for various operating
    frequencies, I find that the stored energy in my workspace goes down as
    frequency goes up. This makes sense, since the inductance of the loop
    will decrease as frequency goes up (the current crowds to the inner
    radius of the wire due to skin effect, and hence inductance goes down).

    However, the FEMM results show that power dissipated in the workspace
    also goes down. This is counter-intuitive, as I expect the resistance
    of the single turn to go up as frequency goes up (due to skin effect).
    Am I missing something simple here ?

    Thanks.

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