https://www.youtube.com/watch?v=bHIhgxav9LY&ab_channel=Veritasium

A video about electricity by Veritasium that was kicked off by Geraint Lewis (Cusp).

sibeen said:

https://www.youtube.com/watch?v=bHIhgxav9LY&ab_channel=Veritasium

A video about electricity by Veritasium that was kicked off by Geraint Lewis (Cusp).

This one popped up on my YouTube suggestions list yesterday. I found it very informative, not the question about the length of time it takes for the bulb to switch on, but the general explanation of how electrickery transmission worketh.

sibeen said:

https://www.youtube.com/watch?v=bHIhgxav9LY&ab_channel=Veritasium

A video about electricity by Veritasium that was kicked off by Geraint Lewis (Cusp).

So did they get it right?

party_pants said:

sibeen said:

https://www.youtube.com/watch?v=bHIhgxav9LY&ab_channel=Veritasium

A video about electricity by Veritasium that was kicked off by Geraint Lewis (Cusp).

This one popped up on my YouTube suggestions list yesterday. I found it very informative, not the question about the length of time it takes for the bulb to switch on, but the general explanation of how electrickery transmission worketh.

I think it came up in my feed but with a different title. “Energy doesn’t flow in wires”, or something like that.

The Rev Dodgson said:

sibeen said:

https://www.youtube.com/watch?v=bHIhgxav9LY&ab_channel=Veritasium

A video about electricity by Veritasium that was kicked off by Geraint Lewis (Cusp).

So did they get it right?

Fiik :)

So what is the big misconception?

TL;DW.

Michael V said:

So what is the big misconception?

TL;DW.

That the energy is transmitted via the wires.

sibeen said:

Michael V said:

So what is the big misconception?

TL;DW.

That the energy is transmitted via the wires.

So we can get rid of them?

sibeen said:

Michael V said:

So what is the big misconception?

TL;DW.

That the energy is transmitted via the wires.

How is it transmitted?

Michael V said:

sibeen said:

Michael V said:

So what is the big misconception?

TL;DW.

That the energy is transmitted via the wires.

How is it transmitted?

Via fields.

Ian said:

sibeen said:

Michael V said:

So what is the big misconception?

TL;DW.

That the energy is transmitted via the wires.

So we can get rid of them?

I’m a fairly conservative electrical engineer so I’ll continue to design with them the old fashioned way.

sibeen said:

Ian said:

sibeen said:

That the energy is transmitted via the wires.

So we can get rid of them?

I’m a fairly conservative electrical engineer so I’ll continue to design with them the old fashioned way.

shill.

sibeen said:

Michael V said:

sibeen said:

That the energy is transmitted via the wires.

How is it transmitted?

Via fields.

Ta. I ended up watching it all.

Michael V said:

sibeen said:

Michael V said:

How is it transmitted?

Via fields.

Ta. I ended up watching it all.

Same here.

Really enjoyed it.

I thought that cusp was going to do an intro, but I see he just provided the question.

I think I’ll get his new book anyway.

A rather interesting video!

Out of curiosity, if the electrons aren’t really moving around much, where do they come from when we have a machine that makes big sparks?

Spiny Norman said:

A rather interesting video!

Out of curiosity, if the electrons aren’t really moving around much, where do they come from when we have a machine that makes big sparks?

Atmospheric molecules, which is why you don’t get “sparks” in a vacuum.

Dark Orange said:

Spiny Norman said:

A rather interesting video!

Out of curiosity, if the electrons aren’t really moving around much, where do they come from when we have a machine that makes big sparks?

Atmospheric molecules, which is why you don’t get “sparks” in a vacuum.

Interesting!

I had a think about that and I remembered back in the old days when I was flying piston-engined aeroplanes around the ones that flew at high altitudes would often have pressurised magnetos, to ensure that they didn’t break down in the low ambient pressure.

So in a hard vacuum even if you had a pair of electrodes at, say, 100 mm apart, you couldn’t get a spark to just across no matter how many volts you fed them?

Spiny Norman said:

Dark Orange said:

Spiny Norman said:

A rather interesting video!

Out of curiosity, if the electrons aren’t really moving around much, where do they come from when we have a machine that makes big sparks?

Atmospheric molecules, which is why you don’t get “sparks” in a vacuum.

Interesting!

I had a think about that and I remembered back in the old days when I was flying piston-engined aeroplanes around the ones that flew at high altitudes would often have pressurised magnetos, to ensure that they didn’t break down in the low ambient pressure.

So in a hard vacuum even if you had a pair of electrodes at, say, 100 mm apart, you couldn’t get a spark to just across no matter how many volts you fed them?

Correct. No matter to excite then no spark. Of course electrons can still flow, otherwise vacuum tubes wouldn’t be able to operate.

sibeen said:

Spiny Norman said:

Dark Orange said:

Atmospheric molecules, which is why you don’t get “sparks” in a vacuum.

Interesting!

I had a think about that and I remembered back in the old days when I was flying piston-engined aeroplanes around the ones that flew at high altitudes would often have pressurised magnetos, to ensure that they didn’t break down in the low ambient pressure.

So in a hard vacuum even if you had a pair of electrodes at, say, 100 mm apart, you couldn’t get a spark to just across no matter how many volts you fed them?

Correct. No matter to excite then no spark. Of course electrons can still flow, otherwise vacuum tubes wouldn’t be able to operate.

Ta.

Spiny Norman said:

sibeen said:

Spiny Norman said:

Interesting!

I had a think about that and I remembered back in the old days when I was flying piston-engined aeroplanes around the ones that flew at high altitudes would often have pressurised magnetos, to ensure that they didn’t break down in the low ambient pressure.

So in a hard vacuum even if you had a pair of electrodes at, say, 100 mm apart, you couldn’t get a spark to just across no matter how many volts you fed them?

Correct. No matter to excite then no spark. Of course electrons can still flow, otherwise vacuum tubes wouldn’t be able to operate.

Ta.

So I’m guessing that high-voltage capacitors have a good hard vacuum inside the casing?

Spiny Norman said:

Spiny Norman said:

sibeen said:

Correct. No matter to excite then no spark. Of course electrons can still flow, otherwise vacuum tubes wouldn’t be able to operate.

Ta.

So I’m guessing that high-voltage capacitors have a good hard vacuum inside the casing?

Not as far as I’m aware. They just use good dielectrics and appropriate spacing.

Spiny Norman said:

A rather interesting video!

Out of curiosity, if the electrons aren’t really moving around much, where do they come from when we have a machine that makes big sparks?

“Electrons aren’t moving around much?”

OK, you’ve talked me into trying to get my speaker working so I can view this.

Pausing at 4 minutes in. OK.
Let’s see what my initial undersatanding is. Electrons move and as they move they push by means of electrotostatic repulsion other electrons further up the chain. By this means the electrostatic repulsion allows electricity to pass through gaps such as transformers. A problem with my viewpoint is that the intrinsic inertia of electrons makes them push back. And that means that a sharp pulse of current at the sender gets smoothed out by the time it reaches the receiver, even in the absense of resistance from the wire. Does this actually happen?

Resistors push back more, and in AC current pushes back when the electrons are flowing both ways. The resistance generates heat. Thus the electricity always flows from sender to resistor, not in reverse.

So my initial understanding overcomes both problems mentioned in the first 4 minutes, that electricity crosses a gap in transformers and that electricity flows from sender to receiver and doesn’t reverse with AC.

Continuing watching.
Yes fields transfer light from the Sun to the Earth at the speed of light. But so does photons, which travels at the speed of light.

Pausing at 6:30 in.

> The electric field propogates through the electric circuit at the speed of light.

If I remember correctly, from my reading about supercomputers, it doesn’t. The analogy with photons fails because there is no magnetic field. I’m quite happy to say that the leading edge of the electric field pulse propogates through the electric circuit at the speed of light but, because electrons have inertia, the trailing edge does not. So the mean of the pulse does not.

> surface charges.

Oh I see, now we’re talking about the Meissner effect, superconductivity.

I suppose that since they’re neglecting the electrical resistance of the wires, it’s fair to treat this circuit as if it was a superconductor. But I really need to point out that negligible resistance is very different to zero resistance. In a normal wire we have no Cooper pairs. Cooper pairs being a pair of electrons with opposite spins that are loosely bound at low temperatures due to electron-lattice interactions.

> Electronm drift velocity around a tenth of a mm per second.

Pause at 7 mintes in. I’ll come back to this later.

I tend to see it as density of charge, more excitation, expressed in fields, the force is in the fields, propagated by, not so much electron flow between points

and perhaps there really is only one electron in the entire universe (a tease)

https://www.youtube.com/watch?v=iph500cPK28

How Wrong Is VERITASIUM? A Lamp and Power Line Story

1/c seconds isn’t a period of time. I haven’t watched the full video yet… maybe he gets to that.

1/c seconds has the units of the reciprocal of acceleration.

ahahahahahahaha right but it’s just SCIENCE right so

just fkn build them wires and do the damn experiment

the 1 in that is metres. I will be linking a vid soon.

JudgeMental said:

the 1 in that is metres. I will be linking a vid soon.

and that 1 metre is important.