Darkfeather
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Joined: 3/13/2007
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quote:
ORIGINAL: njlauren
quote:
ORIGINAL: Darkfeather
Yeah, subtlety is not your forte... And please, as an electrical engineer, do not under any circumstances, go anywhere near the medical profession. You have some interesting theories good sir, by chance do you have any evidence to back it up. I see you were quick to post an internet meme that made you giggle, but not once have you put up a link to any of these ehem, "facts", you spout. Why, because good god man, you completely ignore the fundamental law of electricity. Resistance, resistance, resistance. http://www.cbs42.com/2013/07/12/man-struck-by-lightning-returns-to-work-on-thursday/ http://barnegat-manahawkin.patch.com/groups/breaking-news/p/update-ocean-county-man-hit-by-lightning These people got struck by lightning, LIGHTNING, and lived. http://www.nbc-2.com/story/22698737/man-killed-by-lightning-in-collier-county#.UeCIsG3p4Uo this poor guy however did not. Can you figure out why, and I will give you a hint, its not because of ferrous materials. Its because of yep, you guessed it RESISTANCE. Electricity takes that good old path of least of resistance to ground (can't believe I actually have to explain this to you, but whatever). Electricity does not follow all paths, whoever taught you that should be shot. Next lesson, when you were a kid did you ever do the hot dog experiment? You take a plain ballpark, hook up a 9 volt to it, and eventually presto. Cooked hot dog. Now did it happen in a nanosecond? Did it happen in 2 seconds? No, it took about a minute. Why? Resistance. Now yes, if you take one garden variety human, give him a positive lead in one hand, a negative in the other, and switch on the juice. He will boil like said hot dog. This is what Old Sparky (the Electric Chair, if you don't know the reference) does in no uncertain terms. So yes, you could technically boil a human being with one 9 volt battery. If you could sadistically get them to stay put for the 10 hours it took to do so. Please, please, I beg of you if you are going to continue arguing this nonsense, at least come up with some evidence to support your side, as I am having less and less faith in the profession of electrical engineers
My only comment on this is lightening is a different beast, you are talking gigavolts of potential, but it is static electricity, it is not a current flow, and that makes a big difference. Put a gigavolt flowing at some current level and you would fry them, lightening bolt and you have the chance to survive it.......static charges have far less chance to stop the heart or hurt the nervous system, though they obviously can and have.
As far as electricity following all paths, I think the OP was talking about a circuit where you have both elements in series and parallel, and the formula he gave is for the total resistance of the circuit, which would be summing the parallel and series elements, which means the current does go through all paths. I can't speak that accurately about the human body, but I would hazard a guess it is probably mostly going to be a point to point series circuit, if you put a positive electrode on one part and a negative on another, the current will pretty much go through a single path, series circuit and won't branch (and yes, it is a guess).
And yes, resistance counts, when you have a power source like a 9v battery, the resistance of the load on the circuit will determine how much current it draws, which also means the total power being dissipated through the person is going to be higher, put a low resister across a batter, the total power, and the current, will be lower, higher resistance, higher current and power.Could a 9 volt battery boil the blood? I tend to doubt it, I don't remember the watt hours/pound of a 9v dry cell off the top of my head, but I suspect the batter would be totally drained before it could even get close..on the other hand, a car battery that can put out 300 amps at 12 volts when starting a car, could do it I suspect.
I am not an EE, but I do have a little training on the physiology of the body, and while I suspect a typical tens unit that if you generate its pulse across the chest wil likely do no harm, based on what I know of them, I also know that freak things can happen, a stray current in one time in 1000 can trigger something odd, I saw some weird stuff when I was on a rescue squad you wouldn't think possible, but are, kid threw a tennis ball at his mom, and between the ball hitting her in the chest and her falling down, she went into cardiac arrest, it was a freak thing (fortunately, the husband was home and knew CPR, and the paramedic unit got there fast enough they were able to restart her heart and she came through ok)....I knew one of the ER doctors who was there when she was brought in, and he shook his head, and basically said 'they don't teach this in medical school, what a fucking freak thing'. You could probably throw a tennis ball at a person 10,000 times, and maybe once out of that it would cause something like this.
Me, personally, I would say be mindful and take that into consideration when using electricity above the waist, and if you aren't comfortable, don't do it. Prob the absolutely safest way is to use a dual electrode on one nipple kind of thing, but I also have played above the waist and I think the risk is low enough that I don't worry about it (and that is both having it used on me and on someone else, too).
I am not disputing your response, just what you are basing it on. First, this whole debate started when he brought frequency into the discussion about lightning. And claiming that 7 milliamps was too weak to stop the human heart, instead you needed 15 micro amps. My responses were solely to refute these silly and subsequent claims. As far as freak accidents, hell a car could hop the curb and smash through my bedroom, killing me as I sleep. I already posted that the odds of a TENS killing you is worse than winning the powerball, but hey, my grandmother used to put 120 bucks on that thing every week until she died. Never won though. Some people have tenacious faith on odds
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RE: Tens unit placement on females - 
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