Seebeck effect – which polarity?
Hello,
I have a question about the polarity of the Seebeck effect. One of them is this video:
https://www.youtube.com/watch?v=kj13HT2hMig
At 6:15, it's explained that the electrons start moving clockwise. The technical direction of the current would therefore be reversed. I can also follow the explanation.
On this page – Figure 2 – the technical current direction is shown clockwise, and on the measuring device there is a plus on the right, i.e. the opposite of the video:
https://www.az-delivery.de/en/blogs/azdelivery-blog-fur-arduino-und-raspberry-pi/peltierelemente-und-micropython-teil-3-der-taschenkuhler-oder-minustemperaturen-aus-dem-pc-netzteil
And here too, the "conventional current" is clockwise:
https://www.toppr.com/ask/question/the-direction-of-current-in-an-ironcopper-thermocouple-is/
Which way does the current flow now?
Thanks!
(1 votes)
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You shouldn't orient yourself clockwise, because the direction depends on which side has the higher energy level. This, in turn, depends on which side is warm and which is cold.
On the warmer side, atoms are excited and shoot out electrons, which move towards the cooler side.
The warmer side therefore receives an excess of electrons -> (-) pole.
The physical current flow then occurs from (-) to (+).
Unfortunately, that doesn't help.
What exactly don't you understand about it?
Der Fehler ist gefunden: Kupfer hat eine höhere Thermospannung als Eisen. Kupfer ist also “stärker”, das YT-Video ist hier falsch
The current must flow either clockwise or counterclockwise. I replicated the experiment – ​​the (technical) current flows clockwise.
According to the explanation in the video, it shouldn't. The electrons in the iron (top) should be pushed much more strongly to the right than the electrons in the copper (bottom). Therefore, the iron and its polarity should dominate. So, plus on the left and minus on the right – which it doesn't.