Dangerous Tension: Can a 12V 40Ah Battery Hurt or Kill a Person? Current Lethality Explained

I was wondering what amount of current can kill a person, i.e. can touching a battery with 12 V and 40 Ah can hurt or kill?

If you put the poles to the tongue, the shock and the related consequences may occur.

greetings

oh yes oh yes
What is dangerous? read books about electricity, but if I remember correctly, the residual current circuit breaker is about 40mA (?) - are you saying that? and this is just a harmful dose, and very much at that

70 mA kills ..

in fact, 10mA, which, for example, flows through the bloodstream, kills (this is the acceptable standard for medical equipment) ... but first you have to overcome the insulator in the form of the epidermis. Rather, sticking to a tongue may damage the tongue unless you connect the second electrode to another moist place devoid of keratinized epidermis, so that the current will flow, for example, through the aorta.

And what's more dangerous: voltage or current?

not the voltage but the current kills - e.g. when removing a sweater, when you hear that it shoots electrified (sparks can be seen at night), it can reach several thousand. Volt will not kill us because the current is too low ... a person without a skin has a hand-to-hand resistance above 1kohm, therefore it is considered a free voltage up to about 30V - then in the worst possible cases it can max. current flow below 30mA (Ohm's law), which is considered the upper safety limit.

So 12V from the battery, even if you remove the skin, it is nema right to hurt you a lot.

But I neglected ... hi

The 12 V voltage is as safe as possible. Nothing will happen to you if you touch it. A: for your last post: Only voltage can strike you, for example: wires stick out of a damaged contact from the wall, you can measure the voltage between them, there is no current, because the current does not flow, only after touching the phase wire with ground (earth) the current that flows is the result of the voltage (potential difference between the phase conductor and the earth) and "your internal resistance" (different when, for example, you touch one cable with your hand and the other with your foot, and ninna in the case of head - hand). Safe voltage ranges in the appendix below. Personally, I touched the conductor through which 40 kA of very low voltage was flowing; alive, I feel great

It is accepted:
Feeling the current flow - at a current> 1mA
Muscle spasm and inability to release on its own> 6mA in women, 10 in men
Chest muscle contraction and> 20mA breath loss
Disturbed heart rate> 30mA

The current that will flow through a person depends on the impedance it will provide for the voltage source. The epidermis is the greatest resistance (at voltages exceeding 150V, the epidermis is punctured), the internal human resistance is much lower (therefore removing wire insulation with teeth is not recommended). Of course, human impedance depends on the path the current travels. Under normal conditions, 50V alternating voltage and 120V direct voltage are assumed as completely safe. If you don't have a pacemaker or other serious heart problems, you'll be fine.

The most dangerous is mains frequency, not direct current.
The path it travels depends on what part of it will flow through the heart, and the current flowing through the heart has the greatest impact on a person's life. Electricity can have many other effects on skin, blood, brain, muscles and bones.
Many people check the efficiency of a 9V battery by shorting its terminals with their tongue and nobody has been hurt because of it.

My suggestion: http://moon.um.bierun.pl/~lo/edukacja/bhp/porazeni.html

telewizory wrote:

The most dangerous is mains frequency, not direct current.

And the first application of alternating current is in the electric chair. But the effects of DC voltage are much worse than that of AC (high DC voltage)

Gosia and why do you think so?
In my opinion, one stick that hurts you above a certain limit (e.g. just 40mA)
And the voltage affects the electricity, but the current hurts you
And the fact that the cable was ticking with 40kA current, it was such a current for a very low resistance, and when you grabbed it, it was flowing through you, either very small or at all, because it was flowing through a lower resistance ...
Ohm and Kirchoff's laws, friend ;)

So electricity kills tension.

And with water, how is it? what (min.) voltage of the sea conducts the water ???

depends on water or heavily mineralized, etc ...
distilled theoretically is not conductive because there is nothing to conduct in it, so it can be used to clean a wet phone, etc ...

according to ..... SEP regulations, the intensity of 24mA is already harmful to humans ... and is life-threatening ... it depends on the place of flow through the body ...

Added after 11 [minutes]:

and then a reference to the reading book ... www.sep.com.pl / studies
/ Selected issues of protection against electric shock in electrical installations up to 1 kV - mgr inż. Andrzej Boczkowski, Chairman of the Section of Electrical Installations and Devices at SEP

I recommend if someone can not fall asleep ... hehe

grzesiox wrote:

And the voltage does not affect the current, but the current hurts you

How does not voltage affect the current, what does it? The sum of sunny days in March divided by Andrzej Lepper's IQ? The current that kills you is only due to its cause (forcing) to voltage. Assuming a constant impedance of the human body (e.g. hand -----> leg), it is the voltage level that determines the size of the current; Ohm's law buddy . Before touching, for example, the cable, there is no current, there is voltage, the current appears at the moment of touching. That is why safety voltages have been defined (see above).

hehe there was not supposed to be this "no" - I have already corrected - read now
Windows breaks something and I either eat letters or insert some strange things
and I know what has been determined and that is about the copy electricity and not voltage

Quote:

And with water, how is it? what (min.) voltage of the sea conducts the water ???

Please answer this question. Because I want the LED to work under water and I don't know if I should build a waterproof "capsule" or can I turn it on under water without protection.

If you want to power it from a battery or accumulator, there is no threat to human life (as far as the aquarium is concerned, I have no idea how it will affect the fish). Do not use the AC adapter if you will come into contact with water under normal conditions (e.g. bathtub). You can also use an AC adapter to power the aquarium.

put the diode in the cover because electrolysis will take place and various substances will be released. By the way: CURRENT IS THE MOST IMPORTANT !!! AND DEPENDS ON VOLTAGE AND RESISTANCE !!! CURRENT = VOLTAGE / RESISTANCE !!! And remember that, it's very important !!!! And remember that you can't tell if some cable "goes" with some amps, because it depends on the difference in voltage and resistance !!! so if you connect a 1000ohm resistor to 220V, the current will flow 220/1000 = 0.22A, i.e. 220mA. We cannot talk about voltage conduction either, because voltage is only a term for "electron density" (pathologically) and it has a meaning when we count power !!! power = voltage * current (current). how do you have any questions to come on !!! it is best to understand the current as a gas pipeline (voltage = gas pressure, current (intensity) = gas flow velocity, resistance = pipe narrow (the narrower the greater the resistance)) and this is the easiest way to understand

once there I heard that the 24v is already kicking ... and how are electric lighters and how will it break? there is "something like that" in the middle, when you press it, it gives a spark while kicking how much of it is a volt and what current is it?

Quote:

Do not use an AC adapter

But why ? What is the difference between a 9V AC adapter and a 9V battery

The difference is that the battery will never have a voltage greater than 9V and the power supply can also provide 220V as a result of a failure. Although this is an extreme and very rare case, life is probably not worth risking. These are mostly shoddy power supplies with poor insulation. However, even those with safety approvals pose a risk when they are flooded with water, or even as a result of condensation inside them. If you absolutely want to, use only a good quality power supply and it is best to connect it to the mains outside the bathroom, using a low voltage cable to it.

cinek13 wrote:

But why ? What is the difference between a 9V AC adapter and a 9V battery

The point is that if you use an ordinary transformer to power devices in the bathtub, if there was a breakdown and 230 would appear on the secondary winding instead of 9V, you know what the consequences would be if someone was just taking a bath ...
Of course, this is a purely theoretical protection (I do not think that fittings manufacturers use batteries to power, for example, hydromassage motors), but it is always better to be safe than sorry. By the way - the maximum DC voltage within the bathtub is 12V AC. Such voltages are also used to power jacuzzis or other hydro massages.

And if we could protect them in the form of constantly charging batteries. The diode would take the current from the battery and the power supply would charge it all the time. If there was a "breakdown", the batteries would act like bespieczniki. Just like in the picture. Sorry for the ugly

Well, probably not to the end because you have to turn them on in parallel and then you have power on the diode anyway and the batteries only do what the UPS does for the computer

So what are you suggesting?

Why aren't you writing?

The drawing suggests that this is intended to be aquarium lighting. Some aquatic organisms are sensitive to voltages of the order of uV, therefore attempts are being made to use them as earthquake warning detectors. So it is imperative to insulate everything.
The power supply in the picture is a typical crap, see the posts above. If you use the power supply directly for power supply, no batteries are needed.
If the batteries are 2 shifts: 1 is working, the other is charging and then swapping. In my opinion, this is the safest solution, although the service is absorbing.

It will not be a power supply, but a charger for the Nokia 3510i
And if everything is well insulated, should I be afraid of "puncture" or not?