Re: primary solid/ tube

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Josh,

RF currents travel only along the outside of conductors for "messy and
gnarly" reasons.  So RF currents like the outside but ignore the inside.
It might as well be a hollow tube ;-)

For copper, the depth of the RF currents is "generally" given as:

D = 2.602 / SQRT (F)

Where:

D = The depth in a copper conductor RF currents travel in inches.
F = Is the frequency in Hz.

So if we have a typical Tesla coil operating at around 200kHz the depth of
the RF currents is only:

D = 2.602 / SQRT(200000) = 0.00581825 inches

So even copper tubing is mostly wasted copper in conducting even LF
currents  ;-)

Basically, you want lots of external surface area and the interior copper
is of no use.  In all cases I can think of, go for copper tubing.

Cheers,

	Terry


At 09:17 PM 7/11/2002 +0000, you wrote:
>
>
>Hello all
>
>Quick primary question.
>
>At the Home Depot I saw that there is CU tubing like we all know and solid 
>CU.
>If I’m going to be using a 4 pack Mot PSU would it be better to use the 
>solid stuff?
>Hmmmm?
>
>Read you later
>Josh
>
>
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