Re: Doorknob Caps

Subject:   Re: Doorknob Caps
  Date:   Tue, 10 Jun 1997 22:51:08 +0500
  From: "Alfred A. Skrocki" <alfred.skrocki-at-cybernetworking-dot-com>
    To:  Tesla List <tesla-at-pupman-dot-com>

On Tue, 10 Jun 1997 05:41:49 +0000 wrote;

>  Power factor losses? Do you mean high power factor means high losses?
>  How do you determine losses using the power factor?

When you apply R.F. do a dielectric as in a capacitor, the dielectric
will absorb a percentage of the R.F. and dissipate it as heat and 
this dissipation is inversely proportional to the power factor of the 
dielectric. For example Mica has about the lowest power factor 
(0.0001) of all the available dielectrics and it consequently has the 
lowest losses from R.F. absorption, next to Mica is Teflon with a 
power factor of 0.0002 and then we have Polyethylene at 0.0002 
to 0.0005. a really bad dielectric would be Cellulose Acetate with a 
power factor of 0.01 to 0.1 it will melt down rapidly under R.F. due 
to it's high absorption of R.F.

>  The last I heard losses were resistive in capacitors or inductors.

I would think the resistive losses in a capacitor is going to be 
insignificant, the reactance losses are another story, remember 
were dealing with A.C. Your also forgetting that inductors also have 
hysteresis losses.  


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