General > General Technical Chat
Veritasium "How Electricity Actually Works"
<< < (130/185) > >>
PlainName:

--- Quote from: electrodacus on May 18, 2022, 08:31:44 pm ---
--- Quote from: dunkemhigh on May 18, 2022, 08:08:45 pm ---OK, forget it. It's a lost cause and I am out.

--- End quote ---

It is a lost cause for you as you are the one that has no understanding of the subject.

--- End quote ---

Yes, my lost cause is getting you to a) understand the question and b) answer that without going off on a tangent to confuse things.

Tell you what, just say which of these facts you think are not actually facts:

1. The supply provides energy to the circuit.

2. The resistor consumes energy in the circuit.

Now, everything and anything between those to is completely irrelevant. It doesn't matter if there are electrons, electons, pixies, BFO Tesla(tm) batteries, whatever. None of that matter a jot to those two facts.

3. There's a 1m air gap in that black box between the supply and resistor.

OK? Which of 1-3 do you think is not a fact?
electrodacus:

--- Quote from: hamster_nz on May 18, 2022, 09:01:53 pm ---
As a rough rule, would you say that capacitors allow voltage & current transients to pass through, and but do not pass steady voltages and currents?  (deciding what is a transient and what is a steady voltage can be computed based on the Rs Cs & Ls in the circuit)

So at DC they have infinite resistance, and with signals of high enough frequency they offer very, very little resistance?

--- End quote ---

No it will be wrong to say that electrical current passes through a capacitor even as transient. What you think of as transient current passing through is actually current going in not passing trough.
With say AC you have current going in as capacitor is charged and going out as capacitor is discharged.
At no point there is any current going trough the capacitor thus no energy goes through capacitor.
electrodacus:

--- Quote from: TimFox on May 18, 2022, 09:21:19 pm ---The elementary features I was taught in the first week of electronics 101 were that you can't change the voltage across a capacitor instantaneously, and you can't change the current through an inductor instantaneously.
Analysis of most simple AC and pulse circuits can start from this, and then introduce the finite resistances and time constants.

--- End quote ---

Yes that will be basic introduction to have some roule to memorize. But the reason voltage cannot change instantaneously across a capacitor is because energy will be going in the capacitor and stored.
Same thing with inductor where energy is also stored.
All energy that went in except for the amount that was lost in the process as heat will come out of this energy storage devices.
So there is no electrical enenergy that pases trough a capacitor.
Electrical energy is the integral of electrical power over time.  To have power you need to have a current different from zero and you can not have current through a dielectric like plastic or air.   
electrodacus:

--- Quote from: dunkemhigh on May 18, 2022, 09:55:06 pm ---Yes, my lost cause is getting you to a) understand the question and b) answer that without going off on a tangent to confuse things.

Tell you what, just say which of these facts you think are not actually facts:

1. The supply provides energy to the circuit.

2. The resistor consumes energy in the circuit.

Now, everything and anything between those to is completely irrelevant. It doesn't matter if there are electrons, electons, pixies, BFO Tesla(tm) batteries, whatever. None of that matter a jot to those two facts.

3. There's a 1m air gap in that black box between the supply and resistor.

OK? Which of 1-3 do you think is not a fact?

--- End quote ---

What you call me going on a tangent is essential in understanding what happens. Energy going trough a capacitor will involve electrons traveling through an electrical insulator like air and that is not the case.

1. Yes.
2. Yes.
3. OK

This part is wrong:
"Now, everything and anything between those to is completely irrelevant. It doesn't matter if there are electrons, electons, pixies, BFO Tesla(tm) batteries, whatever. None of that matter a jot to those two facts.
"

It does matter if there are electrons traveling through that 1m air gap as if they where then you and Derek will be right in saying that energy travels outside the wire but for that you need as I mentioned almost three and a half million volt so that air becomes a conductor.
PlainName:

--- Quote ---This part is wrong:
"Now, everything and anything between those to is completely irrelevant. It doesn't matter if there are electrons, electons, pixies, BFO Tesla(tm) batteries, whatever. None of that matter a jot to those two facts.
"

It does matter if there are electrons traveling through that 1m air gap as if they where then you and Derek will be right in saying that energy travels outside the wire but for that you need as I mentioned almost three and a half million volt so that air becomes a conductor.
--- End quote ---

No, it doesn't matter. We are not interested in the how at this point, only whether it does or not. If there are electrons magically jumping the gap that's fine. It's also fine if they don't. All we need to agree on is that energy is provided on one side, consumed on the other, and there is significant clear air between.

Are you happy agreed with that?
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod