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Re: question on safety
Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
Hi,
As the heart runs, there is a "bad time" in the heart beat cycle that
is especially vulnerable to electric shock.
"" A frequent question that arises is why some people are relatively
unaffected by currents between 100 mA and 1 A. Research on the heart
has shown that ventricular fibrillation as a result of electric shock
is also a matter of timing (9). The contraction cycle of the heart
proceeds through various phases, each of which occupy a different
amount of time. Although it is possible to induce fibrillation during
each phase, the difficulty of doing so is dramatically lower during
the reset portion of the systole phase. If a lethal amount of current
enters the heart during this phase, there is a very high likelihood
that the heart will go into fibrillation. The odds of being shocked
during this phase of the heart cycle are approximately 20%. Thus, the
majority of people shocked by a lethal amount of current will live
through it, but it is truly a game of Russian roulette. ""
http://web.bsu.edu/tti/3_3/3_3h.htm
I have "heard", but do not know for sure, that the doctor that found
this out got killed experimenting on himself ;-((
Cheers,
Terry
At 08:11 PM 4/14/2006, you wrote:
thanks a bunch for all the information from the responses. the
Instantaneous amps explanation from the capacitor helped a lot.
also, it seems like a lot of times its just a roll of the dice, but
no matter the outcome its going to hurt. In any case ill tell people
that its possilibly fatal and never too touch it, i know i plan on
not getting shocked anytime soon. thanks again for the information
and explanations.
From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: question on safety
Date: Fri, 14 Apr 2006 17:13:40 -0600
Original poster: BunnyKiller <bunikllr@xxxxxxx>
Hey Michael...
personally I wouldnt touch any part of any coil when it is energized...
as far as volts amps etc its more of a power thing
basically volts times amps in a crude relation...
I have been shocked by 40 volts from a welding machine and it hurt
I have also been semi-directly hit by lightning ( that REALLY hurt)
and I have seen 1" static electricity sparks jump from my finger (
fairly high voltage) I have also experienced a shock from a HID
spark system from a car ( 30KV) with some discomfort. But there are
"records" from list members being hit by 15KV 120ma NST's and being
knocked to the floor and having some great difficulty regaining
thier composure for several hours.
A defibulator can stop a heart and that is no where near the
voltages we use for coiling but considering that the voltage and
amperage in combination is what will do you in... for example,
the 1" static spark jump from the finger was a mild snap with no
after effects, the 40 volt shock from the welding machine was
noticeable only during contact, the lightning strike was
serious... couldnt move for 45 minutes and left "fractal" looking
bruises on my arm chest and leg. The car spark system did more
damage to my elbow when i pulled back and hit the fender...the
fingers had no damage... its a combination of voltage present amps
available and the resistance of the "material" it has to travel thru....
capacitors when charged can do some very serious damage due to the
extreme current available at the time of contact... even small (
low voltage hi mF) caps can blow apart a screwdriver tip when it
contacts both connections... and in reverse, a hi voltage low mF
cap can do the same thing but with more "punch" ( due to the higher
voltage Ohms Law) do some reading on coin shrinking... the
wire or should i say cable ( like in welding cable as thick as your
little finger) will basically vaporize when the cap is discharged
thru it... ehhhh plus the EMF involved does help in blowing it apart too ;)
best bet... dont touch... Coiling is a spectator sport look
but dont touch.... and by the way... if you are running a coil
and have an extra secondary sitting around in the near vacinity be
careful of that one too... but thats a whole new
thread electropherisis etc :)
Scot D
Tesla list wrote:
Original poster: "Michael Ong" <omenowner725@xxxxxxxxxxx>
hello, today i was presenting my tesla coil for my school project,
and i got asked if it was fatal to touch the spark gap or charged
caps. I honestly didn't know the answer to this question and was wondering if
anyone could answer it for me. my coil runs at 8kv 30ma with a cap
size of .01uf and i have always just assumed it was unsafe to
touch and in any case will give you a burn, who cares if it will
kill you. the chart on my class room says that 30ma is close to
"possibly" fatal, but it seems like there are a lot of factors
like the voltage, the path it takes through your body, your body
resistance at the time, and the climate conditions that plan key
roles. anyways i was wondering if there was an easy answer to this
question of how many amps/volts will kill you or if there are just
too many factors that are undetermined to correctly give an
answer. thanks again for the help
-Michael
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