ByY0Runner
Yes, hello, the question is already in the title. Roughly speaking, which is more dangerous or are both equally dangerous?
(2 votes)
Loading...It is a normal cable (Hama, USBC) that has worked perfectly for years.
I had my journeyman's exam part 1 yesterday, and there we built a binary clock (with diodes) and a switching power supply that can be modified. The power supply can only handle 10-30V DC or 10-25V AC, so now I need a power supply that I can connect to a wall outlet. Hence the question:…
Hi, this example confuses me, only I and t are given but you are supposed to calculate the Wh, the photo is only supposed to show the Wh already used so that you can then add them up.
Hey, purely hypothetically, if you climb up there, aside from the risk of falling, etc., there's a certain kind of radiation or current that's life-threatening. Thanks.
Hello folks, Unfortunately, I made the mistake of plugging an American device into the wall outlet here without a voltage converter. Less than five seconds later, the power supply inside the device hissed and smoked away into the afterlife. Fortunately, nothing else happened; nothing burned or smoldered. Nothing got hot, and the casing wasn't hot…
The potential difference (i.e. voltage difference between the two ends of the body) decides which current flows through a body.
According to definition, the soil has 0V. An average person has a body resistance of about 1kΩ.
As some answers say here:
but the wrong conclusion was drawn. This is about the current intensity, which flows over the human being. The current intensity flowing through the conductor is completely irrelevant.
The formula for calculating the current intensity is:
As can be clearly seen, the current flow increases proportionally to the applied voltage.
As an example for 5V and 230V (plug):
From 50mA it can become life-threatening.
A conductor with a high current flow, but a low voltage, would thus be harmless. But could lead to burns, as the conductor would be very hot.
I hope that makes it clearer why some answers are simply wrong.
Voltage, current strength and electrical resistance are related to the ohmic law. With constant resistance, the higher the voltage, the higher the flowing current. So if you connect a high voltage and a rather low resistance (e.g. a human), a high current automatically flows. If the source cannot provide this current, the voltage drops.
Conversely, nothing will happen if you touch a source that can provide a high current, but has no high output voltage, just because the body resistance does not allow this high current at low voltage.
If you simply mean a conductor with “conductors with high current flow” through which a high current flows, without the human being being being part of the circuit, then a contact is basically harmless.
Just because a voltage source can supply 1000A does not mean that it can also drive it.
When you touch a voltage source with 5V and a maximum of 1000A nothing happens.
When you touch a voltage source with 1000V and maximum current 1A, you die.
The comments seem to speak again
Because that’s not either an answer or an answer to your question.
Correctly, the line must have a high voltage and can also supply a high current so that it is dangerous.
Why?
With high tension. I’ve been more frequent. Crawls or ticks something. High voltage generators are a funny thing. I had my pupils touched in 4th grade teaching (with permission of parents, of course).
The comments seem to speak again
Are you wondering? Education has the least.
5 V, 300 A don’t kiss me at all.
300V 5 A tokens beautiful
The A depends on the resistance, i.e. whether 5A flows is not said.
Yes and the internal resistance of my body is quite large. In the megaohm range. And… if you left the question at the top again, it is asked if you prefer to touch a ladder that has a high voltage and thus only a little power flows or a ladder with a low voltage through which much power flows.
All right?
When it comes to a line 5V, it’s just how much current flows through the line. I’ll take it easy. If the ladder is too weak, it can get hot, but that’s another problem.
If, however, there are 300 volts on a conductor, no matter if 5, 6 1 or what do I know for a current, it will leak if you touch it.
Now don’t turn the thing, you wrote 5A
That’s why I said, it’s all right.
300V: 1000R = 0,3A
Of course not.
The intensification threshold for alternating current is at 50mA for the 1k body resistance thus results in the 50V threshold for low-voltage protection.
With direct current, the threshold is even higher.
5V are not dangerous. And that’s what I was about. And yes, I have no problems touching the plus pole of a 12V car battery. Even if you just start and there are hundreds of A.
The body resistance is 1 kilohm not in the megaohm range.
The reason why Multimeter da often displays megaohm is in the small measuring voltage, but in the dangerous voltage range the resistance breaks down by 1 kilohm.
A high voltage is harmless, best example is an electric shock that has 500,000 volts. For comparison a house has 230 volts. The electric shocker has advised 0.001A, A standard fuse has 16 A, but there can also flow 100 A very briefly. Now we can also add that the electric shock DC has and a house AC and waving is more dangerous for humans.
But what would happen if the electric shocker had 500,000 A but only 0.001 V???
Sorry, but that’s pure mischief. The internal resistance of such a device is extremely limited.
From https://de.m.wikipedia.org/wiki/electropulse weapon
The load is strongly limited, otherwise they would be fatal, even the 500 kV pure marketing template, in such a small device you can simply not realize the required insulation of the components.
In theory, one would have had to separate the sentence, because the first part is definitely not a mischief. At that time in school, a classmate should think of 10,000 V long – nothing happened. If that were a 10 KV line as on the masts, he wouldn’t be here today.
Part two should only serve to illustrate and I chose the first best – here my source that the 500,000 V vote:
https://www.kotte-zeller.de/elektroschocker-power-max-500-000-volt-mit-ptb-pruefzeichen
It is true that it must be more than the 0.001 A that I have guessed – they will have been very much in the experiment. The assailant would not notice anything, but the 100 A for me sound quite a lot (a tick has more than our HAK), but if they usually write it. As I also cried, it is also a big difference whether DC and AC, the AC can bring the heart out of the clock.
Where does that come from? I’ve only underlined meien’s point of view the high tension does not have to be harmful. I have already taken 230 V and still live – electronics need this in the morning 😉
I know the Ohmic Law and the same, so I don’t assume… It was also just about the question and it was answered enough.
My speech – especially that with the 10 kV on the high voltage pole.
And where the power goes in and out, finger to finger is not as dangerous as hand over heart to hand – but as we all know after that only 24 h EKG because the damage can occur later.
Someone touches the 230 volts and dies. And now?
You seem to assume that this voltage of 10 kV is at full level as long as you touch it. Unfortunately, this is not true, this is only the idling voltage. It collapses when touched.
Also grazing devices are designed. The charge is decisive.
From https://de.m.wikipedia.org/wiki/Elektrozaun#Building
It is decisive that such a voltage source in turn has a high internal resistance and thus a pulse in its power is limited. The indication of a voltage is therefore something that a layman in electrical engineering must lead to completely false conclusions.
That’s why you’re surviving an electric fence, but if you touch a line in our medium-voltage network, you’ll also use 10 kV.
The time profile of the voltage is always decisive.
High voltage
The current strength is the problem and not the voltage strength
Once we learned in physics lessons, it seems uninteresting today.
And still is not true.
Without high voltage no high current, with high voltage also high current.
The ohmic law also applies to the body.
… and depends on the internal resistance of the body. And it’s usually quite big.
It shocks me something that you are listed here as a community expert for electronics, but are not familiar with the ohmic rules. So I don’t know what’s been taught to you, but I’ve learned something different in my physics study, as well as my training as an electronic. See my answer to the question.
A simple measuring device does not help and displays incorrectly. Anyone who builds muscle stimulus power supplies works with voltages somewhat above 100 volts.
The internal resistance https://de.m.wikipedia.org/wiki/body resistance
The ohmic law applies only to ideal resistances, our bodies are no one. If we really had such a high internal resistance, there would be no accidents with electricity in the household.
This is due to the small measuring voltage of the ohmmeter there, the upper skin contributes massively to the resistance. At higher measuring voltage, the resistance then goes back.
then take a Ohmmeter and start it.
Please with dry hands…
For the human body, you take idR 1000 Ohm.