BySeal6
Ab 50ma ist Strom ja tödlich. Aber wie kann das sein, dass man bei extrem hohen Spannungen (10000V) nicht stirbt? Wenn ich jemanden mit einem Elektroschocker erwische dann passiert dem ja nichts (außer dass er sich erschreckt). Aber bei 10000V und 1000ohm Körperwiderstand kommt ja relativ Stromstärke zusammen, welche ja tödlich ist? Was genau rechne ich da falsch, muss man da noch einiges berücksichtigen?
(1 votes)
Loading...Kann man guten Gewissens Lampen (zB. mit E27-Fassung), die für den Innenbereich gedacht sind, außen montieren, wenn dieser Bereich weitedtgehend/vollständig gegen Niederschlag geschützt ist?
Diese Frage taucht ein in die faszinierende Welt der Elektrizität und ihrer Geschichte. Sie erkundet den Erfinder, der nicht nur die erste funktionsfähige Glühbirne präsentierte, sondern auch maßgeblich zur Entwicklung der Elektrizität als Energiequelle beitrug. Wer war dieser Erfinder, und wie revolutionär waren seine Beiträge zur modernen Beleuchtung? Welche Auswirkungen hatte die Einführung der Glühbirne…
Moin Zusammen, kann ich mit dem Schütz AC 230V Gleichstrom 12V schalten, und 230 V AC ? Bild mit Anschluss ist beigefügt. NC 12V NO 230V vielen Dank
Hallo ich würde gerne ein mit einem arduino generiertes Signal mit einem Transistor verbinden. Aus dem Transistor brauche ich ein positives Signal. Es ist eine einfache blinkschaltung!
Hallo, ich habe eine Lampe bei Amazon bestellt. Aus dessen Anleitung lässt sich nicht herauslesen, wie der Schutzleiter (PE) angeschlossen wird. Ich nehme an, dass es mit einer der Schrauben am Gehäuse angeschlossen werden muss. Am Gehäuse ist kein Erdung Zeichen, an dem ich festmachen kann, wo die Erdung bzw. Der PE angeschlossen werden muss….
Ich war grad mit paar Kollegen am Caprisonne trinken und wir haben uns gefragt warum wir statt Papierstrohhalmen nicht Bambus benutzen. Weil Bambus ist Nachhaltig, wächst extrem schnell nach, ist viel stabiler und weicht nicht so schnell durch und gibt keinen Eigengeschmack ab.
Voltage is not equal to current.
Up to 0.5mA are considered unconditionally harmless.
When you take damage depends on the current density in the body and the duration of action.
At 0.5 mA fed in at the usual points with which one can touch current normally does not form a current density which is dangerous.
Healthy, dry skin is very stress resistant. The so-called leather skin conducts as well as no current until a certain tension is exceeded, the leather skin is pierced and then a strong current can flow. According to standard, up to about 60V should still be made of dry skin.
A grazing fence and electric shock can not work without great tensions. They’re supposed to smash clothes, skin and skin. If you were to apply a stressable tension, it would be either ineffective or very quickly fatal.
Thus, the current is limited, in the simplest case a resistor is used which then limits the current to a maximum of 0.5 mA even if the electrodes are short-circuited.
The high-voltage source then supplies 1000V or more, but it only arrives at the electrodes when no current flows. As soon as current flows across the resistor voltage drop. At least so much that under 0.5mA can flow.
This means that if skin, skin and clothing are broken, then the tension collapses to a very small value and it hardly flows electricity.
And how is it limited in a piezostone? The lighters give off a very high tension, but there is probably no limiter inside. With the Ohm Act I come to 15 amperes (15000 V from the Piezo and 1000 Ohm body resistance). Or can’t you just calculate it like that?
The 15kV are the idle voltage. In the case of a closed circuit, this is not achieved. The voltage rises only until the circuit is closed by a spark or otherwise.
The thing isn’t a nuclear power plant capable of producing mega- and gigawatts. Although you have a power of a few hundred watts for a short time, they only work a microsecond at best. Energy is now power × time, lots of power but almost no time are then hardly energy.
That the power of a flash can supply a million city with power, that’s true. Power, not energy. I cannot imagine that the million city is satisfied with about 10μs of electricity.
Under the most favourable conditions, a lightning arrester gets the highest 10kWh. So the energy of 10 car batteries. In total, about 300kWh are released in a flash, but this is the entire energy that is released in the air as light and bang as well as other energy forms.
The current is limited by simply not much charge there that could flow.
Then I have a summer project
I had an almost completely broken gas heater. The things have really wums, you also notice how hard you have to press the button down. That’s the amount of energy he gets to make electricity.
In any case, the almost broken igniter was ideal to leave the open. The thing was a cylinder with a button on it. Everyone gets curious and plays with rum. And clicks so beautiful. But after 20 to 50 clicks, it works exceptionally, and the thing is 100× stronger than the things from the lighters.
Thank you.
Okay, that makes more sense. Thanks, now I can calm down shocks😅
The shocker may provide a very high voltage. However, the circuit is not decisively determined by the body resistance of the victim, but by the internal resistance of the device. And the “shock” is just a tiny impulse with a duration of several thousandths of seconds. Before a dangerous current flow could occur at all, the voltage has already collapsed.
Because these electric shockers, as well as the grazing fence devices, only emit very, very, very small currents.
Yeah, but that’s U=R*I. So a high current would have to arise due to the body resistance?
After billing, you could supply the whole world with a small battery if a withdrawn stream would not affect the voltage.
Everything has a certain maximum power.
We did not learn differently at school😔