RE: Effective Resistance

["Malcolm Watts" <M.J.Watts-at-massey.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hi Gary,

On 29 Aug 00, at 8:07, Tesla list wrote:

> Original poster: "Lau, Gary" <Gary.Lau-at-compaq-dot-com> 
> 
> I won't pretend to fully understand the factors in determining Q and
> effective resistance but the discussion of operating vs. non-operating(?) Q
> has me wondering about the proximity effect.  As far as I understand this, I
> visualize it something like the drain-source channel of an FET, becoming
> constricted as the surrounding E-field increases.  But this model produces a
> resistor which is voltage-dependant for the FET, or current-dependant for
> the coil.  If this is so, I can see where the operating Q would be less than
> a low-power run.
> 
> So, is the proximity effect current-dependant?

Fascinating question!  Well, the skin effect doesn't show a 
current dependency so I wouldn't expect the proximity effect 
to either. I'll have to go back to my notes on this one but my 
gut feeling is no. 

Regards,
Malcolm