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"Veritasium" (YT) - "The Big Misconception About Electricity" ?
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adx:

--- Quote from: SiliconWizard on January 17, 2022, 08:56:39 pm ---
--- Quote from: adx on January 17, 2022, 02:47:45 am ---So yes, you can transfer energy from one wire to another at DC steady state and it happens all the time.
--- End quote ---

Can you show us? =)


--- Quote from: adx on January 17, 2022, 02:47:45 am ---The field effect does not reduce with distance, that is an illusion caused by objects appearing smaller as they go further away in space(time), so there is no limit to the spacing.

--- End quote ---

That's quite fascinating. Can you show us?

--- End quote ---

Yes and yes. Though conveniently I've run out of time. I was going to draw some diagrams, starting with a vacuum - an Airflo model I'll have to check what type. And a few more calculable facts to check, lest I pull a John Titor.
SilverSolder:

--- Quote from: adx on January 18, 2022, 03:58:09 pm ---
--- Quote from: SilverSolder on January 18, 2022, 02:19:03 pm ---The gravitational potential energy of the blocks is converted to kinetic energy as they accelerate down the slides.  The OP does not explain what happens to the kinetic energy of the blocks at the end of the slide... (do they hit a sand pit?)  but is there any doubt that the energy "followed the blocks" and traveled from the top to the bottom of the ramps?

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I took it to be that the kinetic energy was small enough to not be important (there to stick with the analogy of resistance in wire, show that part of the experiment is the same, and block makes its way under its own steam). The difference is that one block dumps 100m of mgh of energy (and arguably had that extra to start), and the other only 1, plus subtle nonlinearities like you mentioned. We can go on about as much "potential" energy as we want, but the question is over whether the slide "carried" more energy. If you don't like the fact it is 100m higher, then allow the block to fall in a 99m hole and rest there until the end of the universe where this potential energy never becomes "real" (no work), and depending on the situation with the big bang, might never have been. This implies a weak form of acausality. Not mathematically because we can tack imaginary quantities in to match experiment, but conceptually, where the whole meaning of an energy flux rests. To add insult to injury, we don't get our blocks back, so we might not even know what happened to them. We don't know how long it took. Confuse-o-land.

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Let's ignore the variation in "g" for a moment.

We can't ignore the kinetic energy! Unless the friction is so high that the blocks never start moving at all, the blocks will start moving down the ramp, accelerating all the way until some terminal velocity at the end of the ramp.   

Energy cannot be created or destroyed, it can only be transformed into another form!  In the case of the blocks it gets converted into two separate new forms:  kinetic energy, and heat due to the friction.  Each has to be accounted for separately.


Re. block falling into a hole:  The block will keep accelerating the whole way down the hole.  The potential energy that it had at the top is constantly being converted to kinetic energy at each point along the way as its speed increases.  So it seems totally fair to say that the energy follows the block in this case too, no matter what point along the path of the fall you freeze time!  :D
SiliconWizard:

--- Quote from: adx on January 18, 2022, 04:16:56 pm ---
--- Quote from: SiliconWizard on January 17, 2022, 08:56:39 pm ---
--- Quote from: adx on January 17, 2022, 02:47:45 am ---So yes, you can transfer energy from one wire to another at DC steady state and it happens all the time.
--- End quote ---

Can you show us? =)


--- Quote from: adx on January 17, 2022, 02:47:45 am ---The field effect does not reduce with distance, that is an illusion caused by objects appearing smaller as they go further away in space(time), so there is no limit to the spacing.

--- End quote ---

That's quite fascinating. Can you show us?

--- End quote ---

Yes and yes. Though conveniently I've run out of time. (...)

--- End quote ---

Yes, this is convenient. =)

Vacuum tubes require heating (to a highish temperature) some material to "emit" electrons.
Note that I was merely talking about, say, two pieces of wire - ideally with zero resistance. Just like in the original circuit. With no significant heating.
The point was not to reinvent the vacuum tube. Now the alternative to heating that I know of (cold cathode) requires ionizing some gas, so it wouldn't work in a vacuum. But please elaborate, because I'm pretty sure I've missed something. Just keep in mind it shouldn't require more than "wires" in a vacuum.

The point, is, again, to see if the original example in Veritasium's video is really relevant in showing what was claimed when the system reaches steady state.
SiliconWizard:

--- Quote from: SilverSolder on January 18, 2022, 04:26:28 pm ---Energy cannot be created or destroyed, it can only be transformed into another form!

--- End quote ---

I suppose you are assuming conservation of energy, which holds if we consider an isolated system.
Is the universe an isolated system? I'm not sure this has been fully answered yet. =) But this sure goes beyond the points made in this thread.
SilverSolder:

--- Quote from: SiliconWizard on January 18, 2022, 06:48:51 pm ---
--- Quote from: SilverSolder on January 18, 2022, 04:26:28 pm ---Energy cannot be created or destroyed, it can only be transformed into another form!

--- End quote ---

I suppose you are assuming conservation of energy, which holds if we consider an isolated system.
Is the universe an isolated system? I'm not sure this has been fully answered yet. =) But this sure goes beyond the points made in this thread.

--- End quote ---

Can you think of an example where energy is created or destroyed,  rather than transformed?  -  I have always thought it a very basic law of the known universe...
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