BEMF current reversal.

[john_g]

Link

@john g,

Here's Woopyjump's scope shot and the two windings schematic that started the argument: Can you please help explain what's really going on here?

Hi Allen

Do you have a link to the video the screen shot was taken from?

Kind regards

John

[Allen Burgess]

woopyjump.

@john g,

Here's Woopyjump's scope shot and the two windings schematic that started the argument: Can you please help explain what's really going on here?

[john_g]

Hi Allen

No paradox, we now have 2 windings and 2 opposing fields, please see, very rough video:

https://www.youtube.com/watch?v=jgBUFjm6zKQ&feature=youtu.be

Kind regards

John

[Allen Burgess]

LED current direction.

@John g,

"The direction of the induced current caused by the collapsing field will be in the reverse direction compared with the direction when the field was built, thus the red LED flashes, Fig 12".

This language sounds a bit puzzeling when compared with the "Same direction rule", and clearly underscores the apparent paradox.

Here's the hyperlink to the youtube video you cited in your PDF:

https://www.youtube.com/watch?v=Js-zdIWRlXs&feature=youtu.be.Fig

[john_g]

Hi Allen

Many thanks for that. Attached are couple of my ramblings with LEDs and inductors that may be of interest.

Kind regards

John

[Allen Burgess]

Voltmeter position.

@John g,

Thank you very much. That last post was extremely helpful for me.

[john_g]

Position of voltmeter

Hi All

Re the direction reversal, I wrote the attached a few years back, that may be of help. It depends upon the position of the voltmeter.

Kind regards

John

[bistander]

@bistander,

You're another example of someone who acts like they have special knowledge; then when challenged to support their positions, turns to degrading insults to cover their ignorance.

You called Igor's "Reed Switch Spinner ll Schematic" a mess when it consists of merely two simple components: A Reed Switch and an LED! You act like you've never seen any of his videos before and you're telling me to start off with some rudimentary text books. Where have you been?

Well Allen, I was just trying to help with a lesson on inductance which you did not appear to understand. You kept after me for more explanations of other people's experiments concerning a subject I have not been following nor have any interest in analyzing. No good deed goes unpunished, as they say.

bi

[Allen Burgess]

Folding.

@bistander,

You're another example of someone who acts like they have special knowledge; then when challenged to support their positions, turns to degrading insults to cover their ignorance.

You called Igor's "Reed Switch Spinner ll Schematic" a mess when it consists of merely two simple components: A Reed Switch and an LED! You act like you've never seen any of his videos before and you're telling me to start off with some rudimentary text books. Where have you been?

[bistander]

@bistander,

This guy has two reversed LED'S; One lights when he generates a magnetic field in the coil, and the other lights, facing backwards, when he collapses it:

https://www.youtube.com/watch?v=HI5ERdvroec

Thanks Allen but I really don't care. And as I previously mentioned, LEDs don't make good power switches.

Good bi

[Allen Burgess]

Flux switching generator.

@bistander,

This guy has two reversed LED'S; One lights when he generates a magnetic field in the coil, and the other lights, facing backwards, when he collapses it:

https://www.youtube.com/watch?v=HI5ERdvroec

[bistander]

@bistander,

Let's say we have an inductor with a switch on each electrode connected to the poles of a power source. What would happen if we disconnected the coil rapidly first from the negative side? I imagine the collapsing field would reverse the voltage polarity and the current would flow to the positive pole. Now, cutting the power from the positive side should cause the voltage to reverse polarity and the current to flow in the opposite direction to the negative pole. Correct me if I'm wrong.

Wiring two LED's, one to each side of the coil, the positive side reverse biased, should produce a brief flash in both directions, right?

Hello Allen,

No offense intended, but it is obvious that you lack a basic understanding of electricity and circuits. I'm sorry but I cannot teach you all you need to learn to make sense out of your questions and answers I might offer. There are some good on-line tutorials, great text books and, of course, schools where you can gain an education in electricity.

Let me conclude by saying that you are wrong in your imaginary analysis. Maybe another member will correct you.

Good luck,

bi

[Allen Burgess]

Current reversal.

@bistander,

Let's say we have an inductor with a switch on each electrode connected to the poles of a power source. What would happen if we disconnected the coil rapidly first from the negative side? I imagine the collapsing field would reverse the voltage polarity and the current would flow to the positive pole. Now, cutting the power from the positive side should cause the voltage to reverse polarity and the current to flow in the opposite direction to the negative pole. Correct me if I'm wrong.

Wiring two LED's, one to each side of the coil, the positive side reverse biased, should produce a brief flash in both directions, right?

[bistander]

I just have a very simple question...

What happens to magnetic polarity whenever we reverse the input voltage polarity at the coil end terminals?

Hi Ufo,

Isn't this the case whenever you apply AC to a coil, like to the primary of a transformer? The magnetic field responds to the current in the coil. As it reverses so does the field. If the magnetic circuit linking the coil has an air gap where magnetic poles can be identified as N & S, then N-S would alternate to S-N at the applied frequency. Is that what you mean by "magnetic polarity"?

bi

[aljhoa]

The only truth is that the only "thing" that really flows...are the Electrons through the wires.

MIT Physics Demo -- Dissectible Capacitor

Theoria Apophasis1 year ago
You morons, the video is accurate, but your BS understanding is WRONG, its because glass is a dielectric capacitor GO LEARN SOMETHING, read Tesla and Eric P Dollard

Al