Re: Skin depth (again) was: Re: Newbie with questions...

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

Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net> 

How much power is in a candle flame or a safety match? Can you suffer
injury?

People do crazy things (IMHO) like putting fishhooks through their skin and
supporting their weight or having themselves nailed to a cross on Easter in
a religious fervor. Others run 26 miles (or 150).   You decide...

You probably won't die from 50W (although I might point out that a standard
defibrillator draws a lot less than 50 W when charging, and can clearly stop
or start your heart)....

Personally, I've had enough shocks in my life and a few RF burns to not want
any more.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, September 12, 2003 4:36 PM
Subject: Re: Skin depth (again) was: Re: Newbie with questions...


 > Original poster: "Chris the great" <downnessisgoingup-at-hotmail-dot-com>
 >
 > Would it be safe to do this with a low power coil (1-50 watts)?
 > At this power would internal harm be non-existant?  50 watts wouldn't
cause
 > burns if you didn't expose yourself for long, or would it?
 >
 >
 >
 >
 > >From: "Tesla list" <tesla-at-pupman-dot-com>
 > >To: tesla-at-pupman-dot-com
 > >Subject: Skin depth (again) was: Re: Newbie with questions...
 > >Date: Fri, 12 Sep 2003 15:55:07 -0600
 > >
 > >Original poster: Jim Lux <jimlux-at-earthlink-dot-net>
 > >
 > >At 10:01 AM 9/12/2003 -0600, you wrote:
 > >
 > >>Also, after finding that the resonant frequency is around the 700-800
Khz
 > >>range (High enough to cause the skin effect in a human), I've
consistently
 > >>drawn sparks about 3 to 3.5 inches long off it with my fingers.
 > >
 > >
 > >Oh Ho!.... the human isn't all that hot a conductor, so the skin depth is
 > >a LOT deeper than you think it is.  At 150 kHz, skin depth estimates
range
 > >from 30 to 95 inches!  Skin depth scales as the square root of frequency,
 > >so at 1.5 MHz, skin depth is 3 to 9.5 inches...
 > >
 > >
 > >Don't draw those sparks with your fingers!!!
 > >
 >