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Electrocuting oneself
#11
RE: Electrocuting oneself
(November 24, 2015 at 5:12 pm)Quantum Wrote: What property does a material have to have in order to get voltage induced by a magnetic field, that wire has and my body doesn't?

You're really pushing me now aren't you?  Big Grin  

I basically know the answer but I'm going to have to do a little research. The short answer is metals react to magnetic fields while living bodies don't in the same way. That doesn't mean that living things are not influenced by extremely strong magnetic fields but they do so in entirely different ways from metals.

I am neither a metallurgist nor a chemist, not a physicist or a biologist.

Electrical properties
Electrical Type Conductor
Electrical Conductivity 1×107 S/m
Resistivity 9.7×10-8 m Ω

See: Electrical Conductivity 1×107 S/m Quote below.

Quote:Electrical conductivity in metals is a result of the movement of electrically charged particles.
The atoms of metal elements are characterized by the presence of valence electrons - electrons in the outer shell of an atom that are free to move about. It is these 'free electrons' that allow metals to conduct an electric current.

Because valence electrons are free to move they can travel through the lattice that forms the physical structure of a metal.

Under an electric field, free electrons move through the metal much like billiard balls knocking against each other, passing an electric charge as they move.

The transfer of energy is strongest when there is little resistance. On a billiard table, this occurs when a ball strikes against another single ball, passing most of its energy onto the next ball.
If a single ball strikes multiple other balls, each of those will carry only a fraction of the energy.
By the same token, the most effective conductors of electricity are metals that have a single valence electron that is free to move and causes a strong repelling reaction in other electrons. This is the case in the most conductive metals, such as silver and copper, who each have a single valence electron that moves with little resistance and causes a strong repelling reaction.

Semi-conductor metals (or metalloids) have a higher number of valence electrons (usually four or more) so, although they can conduct electricity, they are inefficient at the task. However, when heated or doped with other elements semiconductors like silicon and germanium can become extremely efficient conductors of electricity.

See:  http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2763825/
for below quote
Quote:...The “total body resistance” of a human is composed of the very low (approximately 300 Ω) internal body resistance plus the 2 skin contact resistances. The skin contact resistance will usually be between 1000 and 100,000 Ω, depending on contact area, moisture, condition of the skin, and other factors. The skin thus provides most of the body's protection from electric current.

So even if some voltage was induced in the body the amount induced in the wire would far out weigh that in the body.

Not sure if this will satisfy your concern/question but it is the best I can do for now.
Robert
Today is the best day of my life and tomorrow will be even better.

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#12
RE: Electrocuting oneself
I'm trying very hard not to post anything in this thread about electo-stim and sounding.

Blush
 The granting of a pardon is an imputation of guilt, and the acceptance a confession of it. 




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#13
RE: Electrocuting oneself
(November 25, 2015 at 12:13 am)vorlon13 Wrote: I'm trying very hard not to post anything in this thread about electo-stim and sounding.

Blush

^oh someone is being very naught Wink
Atheism is a non-prophet organization join today. 


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#14
RE: Electrocuting oneself
It twasn't me, but if the chance presented itself . . . .
 The granting of a pardon is an imputation of guilt, and the acceptance a confession of it. 




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#15
RE: Electrocuting oneself
(November 24, 2015 at 5:12 pm)Quantum Wrote: What property does a material have to have in order to get voltage induced by a magnetic field, that wire has and my body doesn't?

Low resistance and high conductivity.  The human body has the reverse of that.
You make people miserable and there's nothing they can do about it, just like god.
-- Homer Simpson

God has no place within these walls, just as facts have no place within organized religion.
-- Superintendent Chalmers

Science is like a blabbermouth who ruins a movie by telling you how it ends. There are some things we don't want to know. Important things.
-- Ned Flanders

Once something's been approved by the government, it's no longer immoral.
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#16
RE: Electrocuting oneself
(November 25, 2015 at 12:44 am)IATIA Wrote:
(November 24, 2015 at 5:12 pm)Quantum Wrote: What property does a material have to have in order to get voltage induced by a magnetic field, that wire has and my body doesn't?

Low resistance and high conductivity.  The human body has the reverse of that.

Yes, my body has a higher resistance than the wire, of course. But in the formula for the voltage induced by a magnetic field, the resistance of the material doesn't appear! You can check...
The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition

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#17
RE: Electrocuting oneself
Omnibus E Plrus Nhilist ' Wrote: Not sure if this will satisfy your concern/question but it is the best I can do for now.

See my reply above
The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition

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#18
RE: Electrocuting oneself
(November 25, 2015 at 11:31 am)Quantum Wrote:
(November 25, 2015 at 12:44 am)IATIA Wrote: Low resistance and high conductivity.  The human body has the reverse of that.

Yes, my body has a higher resistance than the wire, of course. But in the formula for the voltage induced by a magnetic field, the resistance of the material doesn't appear! You can check...

From some of your previous posts, you apparently have some physics knowledge and you know that basic formulas do not take into account various variables and zeros most often do not work.  In this case the wire is assumed to be zero resistance.  Basically, the current is equivalent throughout the circuit and the voltage is distributed along the loads per Ohm's law and if you really expand the formula the zero resistance will rear it's ugly head.  Ohm's law is a basic formula that if zero resistance is inserted you will have infinite current.  There is also impedance to be considered and any circuit with changing voltage that will induce reverse current because the changing voltage will create it's own magnetic field which will induce reverse voltage.

(and resistance is inherently within the formula as E=I*R Where E->Voltage I->Current R->Resistance)
You make people miserable and there's nothing they can do about it, just like god.
-- Homer Simpson

God has no place within these walls, just as facts have no place within organized religion.
-- Superintendent Chalmers

Science is like a blabbermouth who ruins a movie by telling you how it ends. There are some things we don't want to know. Important things.
-- Ned Flanders

Once something's been approved by the government, it's no longer immoral.
-- The Rev Lovejoy
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#19
RE: Electrocuting oneself
Quantum:

I have about reached the extent of my ability to answer your question(s). I think the mathematics are above my head.

I know ohms law and I know why metals (some at least) are conductive (co-valiant bonds and all) but what happens in a living body that makes it unusable as a usable conductor is beyond my pay grade. Such a scenario was never covered when I was learning electronics in the USAF.

So I think I will stop here and hope someone will talk about why a living person doesn't  make a good enough conductor to have a current induced when moving through a magnetic field.
Robert
Today is the best day of my life and tomorrow will be even better.

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#20
RE: Electrocuting oneself
Sorry I was teasing you a bit with my questions, I thought you knew that I'm a physicist by training. But the issue is still, there will be a voltage induced along your body, and I am pretty certain that it will be the same as in a wire.
The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition

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