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electric car hazard

  • Thread starter Thread starter cacciatorino
  • Start date Start date
cacciatorino said:
I don't know, we also talked about not having to take the helicopter's winch rope.
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the helicopter has its own defined potential regarding the ground (the generator is the set composed of the ground, the helicopter and the space interposed). is a "battery" with one of the poles in perfect contact with the soil (being the soil just one of the poles). the same thing applies to the atmospheric discharges (lights) between the clouds and the earth (the generator is the set composed of the ground, the cloud and the space interposed).

when charging is the space between two clouds, the generator is composed of the two clouds (the poles) and the air that lies in us. in this case the discharge takes place between the two clouds and not between one of the clouds and the ground (the horizontal lightnings that are seen in the sky), precisely because in this case no pole of the generator has any connection with the earth.
 
Maybe I figured out what the hunter's doubt is: in the moment in vui comes into contact with the positive pole, it brings you to its own potential (if we consider the body as a good conductor, which is not actually), but before answering you I would like to remember some important things, that I had (and not only me) written in the previous posts:

1) damage does not make them the difference of potential, but the current that passes through the body, and from what is crossed, just few but to do damage

2) continuous and alternating current have different effects on the human body

3) the human body is a discreet insulator, although the currents are sufficient to do damage, to obtain them need not negligible tensions, and very much depends also on the conditions, gross a twenty volts could kill an elderly weak immersed in a water tank, if you touch with your hands dry the two poles of a 24v battery you don't even deny

4) the human body can be seen as a very limited capacitor, practically negligible

when you come into contact with a conductor to a different potential, there is actually a charge pass (as if you were a capacitor) until you bring yourself to its own potential, but this power pass is so minimal (because you are a capacitor with negligible capacity, which means that you just have to charge a minimum to bring you to the potential of the conductor) that nothing happens to you.
you want an example: if you touch an electroly loaded body shop, or a rubbed mesh, the difference of potential is thousands of volts, but the amount of charge that passes is insignificant, in fact you do not die, at most it bothers you.

if you touch phase and neutral of the home line, the difference of potential is 230v (effective) but being a closed circuit, the current keeps you going through to do damage. If you touch only the phase or only the neutral, nothing would happen to you, here is that birds can lay on the cables to thousands of volts, as long as they touch only one at a time. .

the helicopter hook, or lightning, do damage because the tea in such case is one of the two poles of the generator, so it is a closed circuit where you are a piece of conductor, and because the difference of potential is of thousands (if not millions) of volts, so despite your resistance and that of the ground (both bad conductors) the current is sufficiently high to cause damage.
what, I repeat, could happen even with an electric car if:
- one of the two poles is in contact with the soil
- the other pole has an uncovered conductor
- the soil is rather humid, to reduce its resistance
- touch the uncovered conductor, not having other insulating means (even shoes are enough to isolate you from the ground, even if I have never seen scalzi rescuers)
- no one isolated the battery (there will be a hell of a general switch on the battery, right? )
- we assumed that the negative pole of the battery is mass on the chassis, which I don't even know if it's always true.

If all this happens, then yes, you can risk leaving us the pens, or in case you are able to simultaneously touch both poles of the battery that has not been interrupted before intervening, and you don't have practically garments on (they practically lower latex gloves from nurse to isolate from a few hundred volts, or even a normal jacket.

I hope I haven't bored anyone
 
+forte said:
Did you test it?
I don't recommend it.
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I wrote only the phase, or only the neutral, not the phase and the soil.
You want proof? leans a multimeter to the phase conductor, and leaves the other in the air, and looks at how much tension it indicates.
before you intervene randomly, read well what is written.
 
bip said:
Maybe I figured out what the hunter's doubt is: in the moment in vui comes into contact with the positive pole, it brings you to its own potential (if we consider the body as a good conductor, which is not actually), but before answering you I would like to remember some important things, that I had (and not only me) written in the previous posts:
Click to expand...
Yes, you understand what I meant and thank you for the time you dedicated to me. to the "shorts" you listed perhaps lacks the need to intervene in a rainy day! :
 
bip said:
I wrote only the phase, or only the neutral, not the phase and the soil.
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probably refers to the fact that, unlike the birds leaning on the single cable at 380 kv and survive, we are always good or bad also resting on the ground, and we don't always have the safety shoes and not always the soil is dry and sometimes we could find ourselves outdoors in the rain.
 
gil said:
as I am incompetent on the subject, place the opinion of a person who while not being a tecnic, or is usually praparated and reasonable.link disinformatico
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Sorry, but it's not relevant to the topic: the article talks about the power needed to recharge, not to the risks in case of an accident.
 
This is my last post on this thread.

the motivation is the cancellation of my message #65 inherent in the previous statements contrary to the fundamental laws of electronics.

if it is indisputable the right of anyone to express their perplexity on any scientific fact, even on those who may be considered the fundamental pillars of our current knowledge, affirming opposing concepts does not enjoy the same privileges.

in my previous posts I tried to explain with examples and anecdotes what the scientific world knows as kirchhoff law to tensions. Although a user has continued to express doubts, both me and other colleagues have given their best in exposing this law in descriptive terms to make it more “digestible” even to those who have not studied electrotechnical.

This does not mean that the law of kirchhoff is in some way questioned or can be reviewed. Things are just like this. or not. who asserts the opposite can only be defined as chills, comparable to what designs machines with higher efficiency than the unit or that it states that the earth is flat and not “round”.

express doubts and make contrary statements are two very different attitudes. the first is always accepted, the second is acceptable only in the “revisionist” sites. to me it does not seem that cad3d is a revisionist site, but after the deletion of my post #65, this thread became it in full title, why I will not post to us anymore.

my last statement is what could have been given from the beginning:

Do you have any doubts? go to study electronics.
 
Last edited by a moderator:
exxon said:
This is my last post on this thread.

the motivation is the cancellation of my message #65 inherent in the previous statements contrary to the fundamental laws of electronics.
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Then:
(1) the Regulation prohibits the application of the moderators in public
2) the moderation I made on your message was not related to the concepts expressed but to the terminology used. as perhaps you had understood I do not accept, in the areas of my moderation, expressive modes that I consider lesive of the reputation of other users, even when in light form as in your case.
 
I was reading this discussion that I had not read all before
two fast things
the first on cattle fences
the measurement in thousands of volts is calculated with 500 ohms of resistance and the current is given to impulses on all the fence
the second on the danger of indirect contacts as carcasses cars
the human body in this case behaves as the ground system with the feet that simulate the picchetti major is the resisivity of the soil
less is the current that will cross the human body
 
exxon said:
This is my last post on this thread.

the motivation is the cancellation of my message #65 inherent in the previous statements contrary to the fundamental laws of electronics.
Click to expand...
Didn't you say "eh up"?
 

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