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Em 17/02/2014 23:18, Peter Terren escreveu:
A quote from Antonio Carlos M. de Queiroz in a recent post in regard
to contact with Tesla coil sparks.
"A common effect is pain at the joints, because there the resistance
is higher and most damage occurs."
Is that really true? To me the explanation is dubious. Consider these
facts:
- Body resistance between two chest pads for defibrillation is around
50 ohms.
(This is a machine printout at defibrillation - personal best skin
prep of mine was 48 ohms)
Considering the situations where a defibrillator is used, subsequent
eventual pain is not a problem. And the device applies a single pulse.
- A TENS machine is an electrostimulating device that uses a current
from 1 to 100mA to treat pain.
This is a mainstream machine used by physical therapists to treat pain
(including joints) - not to cause it.
www.kau.edu.sa/Files/0053044/Subjects/9b-TENS.doc
A small Tesla coil can easily produce arcs with several amperes of current.
I find nothing about joint pains after serious DC shock or lightning
injuries.
http://www.patient.co.uk/doctor/Electrical-Injuries-and-Lightning-Strikes.htmNowherehave I seen information about joint pains and current from DCthrough
to 27mHz.I can find nothing that suggests that there is a higher
resistance injoints. On the contrary, joint fluid is a conductive
biological fluid andhas no impeding cell membranes.Consider the
current from a tolerable Tesla coil spark that one uses forstunts. Is
it really likely that significant tissue damage will occur acrossa 50
ohm body part. (excluding entry and exit points where current
islocalized to a tiny point?Comments please (with references). Just
like medical science, personalanecdote is not
sufficient.PeterTesladownunder.com.
About this I have just my personal anecdote. In the first time (and
last) when I tried to draw an arc from a small Tesla coil to a finger I
ended with a third degree burn in a spot and joint pain in the affected
finger for weeks. In the last days I was doing measurements in a drsstc,
and eventually drawing corona to the leads or a fluorescent lamp (the
tube of a compact lamp) that I was holding in my left hand. Now I have
joint pain in that hand. Not intense. I stayed close to the coil in
operation for long time, and, possibly by coincidence, or not, got a
severe and unusual back pain...