General > General Technical Chat
Veritasium "How Electricity Actually Works"
IanB:
If you write words that agree with the textbooks, then you are wasting your time because we can all read the textbooks.
If you write words that disagree with the textbooks, then you are wasting your time because you won't convince anyone else and apparently you don't wish to learn.
Either way, you are wasting your time posting.
electrodacus:
--- Quote from: IanB on May 22, 2022, 06:51:48 pm ---If you write words that agree with the textbooks, then you are wasting your time because we can all read the textbooks.
If you write words that disagree with the textbooks, then you are wasting your time because you won't convince anyone else and apparently you don't wish to learn.
Either way, you are wasting your time posting.
--- End quote ---
Show me the textbooks that say "energy doesn't travel inside the wire" as that is exact quote Derek made.
Why anyone will use wires to transfer energy if they are not needed ?
Also a switch is a capacitor before is being closed so why will you need to close a switch if energy can be transferred through a capacitor.
I do see I'm wasting my time but the alternative is to let humanity fall even more in to idiocracy.
snarkysparky:
""Many of you mentioned the displacement current but that is a mathematical concept so the equations work not a real current.""
Yes it is a real current.
In a parallel plate capacitor when charge accumulates on one plate the rising electric field ( result of the charge accumulation ) causes charge to leave the other plate (if there is a return path)
This is exactly the mechanism of displacement current. It requires a continuous charge buildup between the plates and this is current entering / leaving the plates.
http://teacher.pas.rochester.edu/phy122/lecture_notes/Chapter35/chapter35.html
electrodacus:
--- Quote from: snarkysparky on May 22, 2022, 07:54:18 pm ---""Many of you mentioned the displacement current but that is a mathematical concept so the equations work not a real current.""
Yes it is a real current.
In a parallel plate capacitor when charge accumulates on one plate the rising electric field ( result of the charge accumulation ) causes charge to leave the other plate (if there is a return path)
This is exactly the mechanism of displacement current. It requires a continuous charge buildup between the plates and this is current entering / leaving the plates.
http://teacher.pas.rochester.edu/phy122/lecture_notes/Chapter35/chapter35.html
--- End quote ---
Maxwell had no idea what an electron is ?
The displacement current is fictional (to make observed results fit the math).
If energy was to pass through a capacitor as it does through a wire (with or without resistance) then no energy could ever be stored in a capacitor.
Those 72mJ did not pass through the 1000uF capacitor but in to it and will remain there as stored energy.
That is why when you reverse the voltage supply wires you no longer get anything as it is already charged and all energy delivered by the supply 288mJ will end up dissipated as heat in the wires.
So before capacitor is charged
144mJ = 72mJ on wires as heat + 72mJ in the capacitor as stored energy.
After capacitor is charged there is no energy transfer and if you reverse the supply polarity you have
288mJ = 288mJ on wires as heat and that is all then no more energy flow until you reverse the wires again and then it will again be 288mJ = 288mJ as heat.
rfeecs:
--- Quote from: electrodacus on May 22, 2022, 08:28:01 pm ---Those 72mJ did not pass through the 1000uF capacitor but in to it and will remain there as stored energy.
--- End quote ---
Where in the capacitor is the energy stored? What is it's physical location?
--- Quote ---288mJ will end up dissipated as heat in the wires.
--- End quote ---
I believe you have said that this heat energy is radiated away in the form of infrared radiation. What is the difference between infrared radiation and radio waves?
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