General > General Technical Chat

Veritasium "How Electricity Actually Works"

<< < (31/185) > >>

electrodacus:

--- Quote from: hamster_nz on May 03, 2022, 11:06:28 pm ---And the answer in the "one cap, one switch" situation?

--- End quote ---

Do you mean a charged cap shorted by a switch ?
If so then all energy contained in the capacitor ends up as heat.

electrodacus:

--- Quote from: TimFox on May 03, 2022, 11:07:48 pm ---
1/4 of the energy in each capacitor, for a total energy in the two-capacitor system half the original energy.

--- End quote ---

Yes exactly.

Naej:

--- Quote from: bsfeechannel on May 02, 2022, 08:52:53 pm ---One of the problems with analogies is that you have to have a deep understanding of model's (in this case hydraulic) system. Derek seems to have done his homework. He points out that unlike a hydraulic system (where the water from the pump to the load has high pressure and low velocity and the water in the return pipe has lower pressure and higher velocity), with an electric circuit, there's no difference in current density or drift speed for the  electrons going in and coming out of the battery.

--- End quote ---
Well in the case you described the "load" (a reducer/nozzle) is analogous to a transformer, and there's no difference in mass flow going in and coming out of the pump. The analogy is tight, here  :-+

--- Quote from: bsfeechannel on May 02, 2022, 08:52:53 pm ---What is making the electrons drift is not some kind of pressure. It is just a portion of the electric field generated by the battery that does not contribute to the transfer of energy from the battery to the load. So electrons in the wire are not being pushed by each other like in a fluid. They're just parading in response to an external cause (the electric field) exactly like in the load.

--- End quote ---
What is making the electrons drift is a kind of pressure, called electric potential. They are being pushed by each other, but unlike in fluids, it happens at long range and can easily go through some solid matter.

rfeecs:

--- Quote from: electrodacus on May 03, 2022, 11:09:13 pm ---
--- Quote from: TimFox on May 03, 2022, 11:07:48 pm ---
1/4 of the energy in each capacitor, for a total energy in the two-capacitor system half the original energy.

--- End quote ---

Yes exactly.

--- End quote ---

I have a suggestion.  Forget the two capacitor question.  Veritasium's experiment uses a battery.  Maybe start a new thread about two capacitors?  It's off topic.

We don't have to understand batteries beyond they are ideal voltage sources.  They maintain a constant voltage across their terminals.  Not complicated.  Go from there.

Here's a nice video to get you started, 1940's style Veritasium:


electrodacus:

--- Quote from: rfeecs on May 03, 2022, 11:29:14 pm ---
--- Quote from: electrodacus on May 03, 2022, 11:09:13 pm ---
--- Quote from: TimFox on May 03, 2022, 11:07:48 pm ---
1/4 of the energy in each capacitor, for a total energy in the two-capacitor system half the original energy.

--- End quote ---

Yes exactly.

--- End quote ---

I have a suggestion.  Forget the two capacitor question.  Veritasium's experiment uses a battery.  Maybe start a new thread about two capacitors?  It's off topic.

We don't have to understand batteries beyond they are ideal voltage sources.  They maintain a constant voltage across their terminals.  Not complicated.  Go from there.


--- End quote ---

You are wrong about the fact that it is of topic.
There is no difference in this context between a battery and a capacitor as they are both the source of energy in the experiment.
Understanding what energy is and how capacitors work (energy storage devices) is critical to understand the problem.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod