General > General Technical Chat
Veritasium "How Electricity Actually Works"
SiliconWizard:
While the new video is a good effort and gets into a lot more details than the initial one, there still are points that are definitely not addressed.
Some of them come from - as was mentioned in the other thread early - a chicken-and-egg problem.
electrodacus:
--- Quote from: rfeecs on May 01, 2022, 06:20:12 pm ---So then how does the energy pass across the empty space between the switch and the lamp in the initial transient few nanoseconds?
How does it get from the bottom two wires to the top two wires?
"Capacitive coupling" doesn't equate to the energy only flows in wires.
--- End quote ---
Replace the battery (source) with a charged capacitor so just imagine a simple two plate capacitor that has excess of electrons on one plate and a deficit of electrons on the other.
Then have two other much smaller capacity capacitors that are empty (no stored energy) in series with a light bulb or resistor (same thing).
That group of two capacitors and a resistor all in series can be equivalent with a single capacitor so when you connect (using wires) that to the charged capacitor is like modifying the existing charged capacitor by increasing his capacity thus charges will be redistributed.
If you can imagine all that you will notice that there was no flow outside wires (this includes the capacitor electrodes).
You can also imagine just a charged capacitor on witch you increase the plate area. While you do so the energy stored will remain the same for ideal case while in real case part of it is lost due to plates having a non zero resistance so when electrons move to rearrange you will have some IR losses.
All energy travels trough the plates in this case so trough conductors/wires.
electrodacus:
--- Quote from: SiliconWizard on May 01, 2022, 06:28:07 pm ---While the new video is a good effort and gets into a lot more details than the initial one, there still are points that are definitely not addressed.
Some of them come from - as was mentioned in the other thread early - a chicken-and-egg problem.
--- End quote ---
There is no chicken-and-egg problem as there you ask witch one was first but here you start with either the chicken or the egg so that problem of what was first is non existent.
rfeecs:
--- Quote from: electrodacus on May 01, 2022, 06:55:22 pm ---
--- Quote from: rfeecs on May 01, 2022, 06:20:12 pm ---So then how does the energy pass across the empty space between the switch and the lamp in the initial transient few nanoseconds?
How does it get from the bottom two wires to the top two wires?
"Capacitive coupling" doesn't equate to the energy only flows in wires.
--- End quote ---
... All energy travels trough the plates in this case so trough conductors/wires.
--- End quote ---
Apparently you mean current, not energy.
electrodacus:
--- Quote from: rfeecs on May 01, 2022, 07:06:35 pm ---Apparently you mean current, not energy.
--- End quote ---
If there is no current there is no energy.
There can be current and no energy flow if current flow is constant and it travels trough a superconductor loop.
I think that the charged capacitor where you change the size of the plates is the most simplified example I can think of that represents the initial few moments after the switch is closed.
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