RE: Effective Resistance

["Lau, Gary" <Gary.Lau-at-compaq-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

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?

Gary Lau
Waltham, MA USA


>Original poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net> 
>
>Malcolm -
>
>You pointed out the problem by using your example. There is more than one
>type of Q factor with Tesla coils. If you use the wrong Q factor you get
2.7
>MV of voltage. You must use the operating Q factor to get the correct
>voltage. You will find this Q by using the correct Reff resistance. The
>problem is to find the correct Reff resistance (ESR?). How do you do that?
>Refer to my post "Q Factor and Overall Efficiency". What are your comments?

<snip>