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Author Topic: MH's ideal coil and voltage question  (Read 487891 times)

tinman

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Re: MH's ideal coil and voltage question
« Reply #885 on: June 04, 2016, 08:47:15 PM »
author=webby1 link=topic=16589.msg485757#msg485757 date=1465064199]



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Resonance is when the external stimuli changes the amplitude without changing the frequency and this happens when the input is at or about the resonant frequency of the system.

Yes,so where is this input that is needed for the bell to resonate ?

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More so,, when the input adds to the amplitude,, this can be a short pulse that reoccurs at a rate that is within the resonant frequency of the system

That is correct.

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OR it can be a short pulse that reduces the amplitude

That is incorrect.
In physics, resonance describes when a vibrating system or external force drives another system to oscillate with greater amplitude at a specific preferential frequency.

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When no interaction is taking place then the system will oscillate at its natural frequency forever with the same amplitude.

No it will not. The oscillating body has an elasticity value that will dampen the oscillations,and eventually the oscillations will stop.
There is no object that will oscillate,that dose not have this elasticity value,or a resistance to change,that would allow the oscillations to continue on for ever.

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The amplitude can go up or down and if you think about it, if the input were to continue the amplitude would continue to increase,, with ideals it would grow to an infinite amplitude.

Lets stick to real world applications here,as we do not have ideal devices-they are a myth.


Brad

MileHigh

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Re: MH's ideal coil and voltage question
« Reply #886 on: June 04, 2016, 10:15:16 PM »
Second--i have provided the definition of an ideal torque,where torque is the application of energy to a system or object,and where that energy is ideal-->an ideal torque is an ideal energy source. An ideal torque will maintain it's chosen value,regardless of the opposition force placed upon this torque.
You not understanding this,is also another fail on your behalf.

And you fall flat on your ass for the 10,000th time.  For starters, there is no such thing as an "ideal energy source."  Plus your bloody definition doesn't even make sense.  Like I said, it just never ends.

Here is what an ideal torque would be:  A system that applies the same torque to the spinning flywheel regardless of the angular velocity of the flywheel.

If you understood what has been discussed ad infinitum already, you would realize this right away, it would be a no-brainer.  And you would never in a million years use the term "ideal energy source."

But no!  But no!

Magluvin

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Re: MH's ideal coil and voltage question
« Reply #887 on: June 04, 2016, 11:49:16 PM »


   With a capacitor do you have to look at it from the perspective of
   electrons and sort of "holes"?
           John.

Well if we take electrons from the Pos plate, then there are what they call holes which leaves that plate positively charged. And if we take those electrons and put them on the Neg plate, it becomes negatively charged as we have more electrons on the Neg plate than a cap with 0v charge.

Mags

Magluvin

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Re: MH's ideal coil and voltage question
« Reply #888 on: June 05, 2016, 12:39:31 AM »
Mags,

You do agree however that if we measure the energy burned up in the total circuit resistance involved in cap to cap transfers, it will indicate half of the total energy?

Do you not also agree that the value of the total circuit resistance makes no difference in the energy and that it does indeed always dissipate half the starting energy and that it determines the tau of the transfer?

The 0 Ohms case seems to be a special case, and one that we can not achieve.

"
You do agree however that if we measure the energy burned up in the total circuit resistance involved in cap to cap transfers, it will indicate half of the total energy?"

I agree agree in the real world. ;)


"Do you not also agree that the value of the total circuit resistance makes no difference in the energy and that it does indeed always dissipate half the starting energy and that it determines the tau of the transfer?"

I also agree, in the real world. ;)


"The 0 Ohms case seems to be a special case, and one that we can not achieve."

Darn tootin it is. ;D   Here is my issue with it.

When we bring up the cap to cap loss, like back when we were talking about it when Woopy did his video and was very surprised by the 50% loss, the argument from you guys was that it was the resistance, no matter what value above 0ohm, is the cause for the loss. And you used the Ideal cap to cap, zero resistance transfer as an example of how we could get 7.07v in each cap from 10v. Well that cannot be used any longer as a proper explanation of how the energy was lost, because now we all know that we cannot get 7.07v in each cap from 10v in the ideal world.  I think people reading should know this 'now'.

So it is 'seemingly' a special case.  It can no longer be used in these arguments to prove the point that resistance is the loss. And as you say, "seems to be a special case, and one that we can not achieve", then maybe arguments using Ideal caps, ideal coils, and Ideal voltage sources that can not be achieved should not be used as examples either, because if we can not achieve them, we can not be certain of the outcome, just as we have found this kink in the cap to cap situation. Is it possible that we may find other kinks in these ideal world components as to how we thought they were by just thinking a little deeper? If we say not, then we have learned nothing in this cap to cap argument and we are just writing it off. ;)

Or, we could put our thoughts together an try to figure out if it is more than just a special case by thinking it through further than just settling on the idea that it is a special case without explanation.  Why would we stop there? ;D

Mags




MileHigh

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Re: MH's ideal coil and voltage question
« Reply #889 on: June 05, 2016, 01:32:24 AM »
Yes.it oscillates at it's natural resonant frequency,but the bell dose not resonate.

Alas, so near yet so far.

MileHigh

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Re: MH's ideal coil and voltage question
« Reply #890 on: June 05, 2016, 01:39:53 AM »
You have not provided one example where an object will resonate by it's self,and your bell,and wine glass examples have been proven to be wrong.

Proven to be wrong in your head only.  You are your own best enemy.

MileHigh

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Re: MH's ideal coil and voltage question
« Reply #891 on: June 05, 2016, 01:42:21 AM »
The reason you cannot,and will not provide a circuit for the ideal voltage source in question,is because it dose not,and cannot exist.

Ah, so it was a "trick" question.  Knowing you, I actually believed that you were literally asking for a circuit for an ideal voltage source.  It's that bad.

MileHigh

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Re: MH's ideal coil and voltage question
« Reply #892 on: June 05, 2016, 01:48:40 AM »
Your answer is based around a circuit that cannot exist--and the proof of this,is by way of you not being able to draw such a circuit for the ideal voltage source.

And I see we have gone full-circle here and we are starting the discussion over right from the beginning.  We are back to the "problem child" at school that can't cope with using simple abstractions to better understand how circuits work.  It's information overload.

tinman

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Re: MH's ideal coil and voltage question
« Reply #893 on: June 05, 2016, 05:57:08 AM »



Not a problem.

 or using the understanding to make an emergency power supply just in case the planes power supply failed when you could not deploy a prop driven generator.

A system in resonance,, it is kind of fun. 



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The air is interacting with the bell and its oscillation,, there is an exchange of energy in that transaction that will reduce the amplitude of the bells oscillation without changing the frequency.  This interaction is soundly demonstrated by the very sound you here,, the pitch would change if it were not in resonance.no.

That is correct,and that is the bell oscillating at it's natural resonant frequency. The bell will ring down(the sound level from the bell will reduce over time)due to dampening by both the air it sits in,and the bells own resistance to change(elasticity).

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In physics resonance describes the condition where the external stimuli interacts with ONLY the amplitude,, not only increasing it but any change to that amplitude

And that answers your question.
The bell has no external stimuli acting upon it,it has a dampening effect from the air it resides in-not a stimulant effect from the air it resides in.
The bell can only resonate when an external stimuli acts upon it to maintain or increase it's vibrational amplitude.

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.and yet you have seen this with your pulse motors and PM's,, your RT,, you have shown many things that show this interaction being a two way thing.

The RT works by deforming the magnetic field of a PM,and then letting the field reform at the same time the electromagnetic stator field is collapsing.This causes a large reversal of the magnetic field the stator coil B see's. Due to the shape and design of the stator core,this field also travels around the stator core to the other side,to create a magnetic field at stator core A,due to the flux path of the core it self. This is why the motor speeds up,and gains torque when a load is placed on the outer coil of stator B.

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I was schooled on what resonance is by a group of engineers that had to know there stuff,, I was very young but remember the differences between an oscillation and a system that is in resonance,, in there line of work it could be the difference between an airplane flying nicely through the air and one that rips itself apart,,

With the planes,that is aeroelastic flutter,the same thing that bought down the Tacoma Narrows Bridge. The outside force acting upon the plane,is the wind due to the planes own motion.

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With some of the reply’s by others I am wondering if in the electrical world the difference is not taught because in that space there is no difference??

When an inductor resonates,it's amplitude is at a continuous maximum that can be gained from the outside force acting upon it.


Brad

tinman

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Re: MH's ideal coil and voltage question
« Reply #894 on: June 05, 2016, 06:32:16 AM »
And you fall flat on your ass for the 10,000th time.    Plus your bloody definition doesn't even make sense.  Like I said, it just never ends.





But no!  But no!

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Here is what an ideal torque would be:  A system that applies the same torque to the spinning flywheel regardless of the angular velocity of the flywheel.

An ideal torque is an ideal energy source. An ideal torque will maintain it's chosen value,regardless of the opposition force placed upon this torque.

Gee it's hard with you MH.
Im sorry to say MH,but in engineering,torque is not only related to flywheels,and so your answer is very limited(like your self),where as mine covers the whole spectrum.
Nice try,but you missed the boat again. :D

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For starters, there is no such thing as an "ideal energy source."

And yet your question is based around such a device lol.
So it's much like asking--how fast could a flying pink pig go ?.

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If you understood what has been discussed ad infinitum already, you would realize this right away, it would be a no-brainer.  And you would never in a million years use the term "ideal energy source."

Your ideal voltage source !is! an ideal source of energy.
For a voltage to be placed across an inductor,and a current to flow through that inductor,requires a source of energy. Since your question only has two components,1-the inductor,and 2-the ideal voltage source,then the ideal voltage source must be providing the energy.
You never managed to provide an example of a voltage source that dose not contain energy ::)-but no surprise there ;)

It is funny to watch you try and squirm your way out of mistakes you know you have made lol.
You never like answering questions asked of you either-->like,when is an inductor resonating?,and when is it just ringing down at it's resonant frequency?.
I mean,we have all discussed this on many occasions,and TK has shown a coil ringing down,and a coil resonating many times. But you will not answer those two question's,as you know that means that your self resonating wine glass and bell theory will fall in a big heap.

I will try one last time to try and show you what resonance is,and when something is resonating,and what oscillating at a natural resonant frequency is.
It dose not come much more simple that this.

https://www.youtube.com/watch?v=XzFvhQgsS-Y


MileHigh

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Re: MH's ideal coil and voltage question
« Reply #895 on: June 05, 2016, 06:50:56 AM »
[I will try one last time to try and show you what resonance is,and when something is resonating,and what oscillating at a natural resonant frequency is.
It dose not come much more simple that this.

https://www.youtube.com/watch?v=XzFvhQgsS-Y

You are so utterly hapless and confused when it comes to this stuff sometimes Brad, it just blows my mind how you can't think for yourself and achieve a "normal" level of understanding.

https://en.wikipedia.org/wiki/LC_circuit

LC circuit

An LC circuit, also called a resonant circuit, tank circuit, or tuned circuit, is an electric circuit consisting of an inductor, represented by the letter L, and a capacitor, represented by the letter C, connected together. The circuit can act as an electrical resonator, an electrical analogue of a tuning fork, storing energy oscillating at the circuit's resonant frequency.

MileHigh

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Re: MH's ideal coil and voltage question
« Reply #896 on: June 05, 2016, 07:35:24 AM »
An ideal torque is an ideal energy source. An ideal torque will maintain it's chosen value,regardless of the opposition force placed upon this torque.

Gee it's hard with you MH.
Im sorry to say MH,but in engineering,torque is not only related to flywheels,and so your answer is very limited(like your self),where as mine covers the whole spectrum.
Nice try,but you missed the boat again. :D

And yet your question is based around such a device lol.
So it's much like asking--how fast could a flying pink pig go ?.

Your ideal voltage source !is! an ideal source of energy.
For a voltage to be placed across an inductor,and a current to flow through that inductor,requires a source of energy. Since your question only has two components,1-the inductor,and 2-the ideal voltage source,then the ideal voltage source must be providing the energy.
You never managed to provide an example of a voltage source that dose not contain energy ::) -but no surprise there ;)

It is funny to watch you try and squirm your way out of mistakes you know you have made lol.
You never like answering questions asked of you either-->like,when is an inductor resonating?,and when is it just ringing down at it's resonant frequency?.
I mean,we have all discussed this on many occasions,and TK has shown a coil ringing down,and a coil resonating many times. But you will not answer those two question's,as you know that means that your self resonating wine glass and bell theory will fall in a big heap.

Since I tried to give you the real definition of an ideal torque and you rejected it, then I will say your comments about torque are completely idiotic.  Not using the proper mechanical variables of torque and angular velocity for your "explanation" is completely idiotic.  Making reference to an "ideal energy source" is also completely idiotic.

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Im sorry to say MH,but in engineering,torque is not only related to flywheels,and so your answer is very limited(like your self),where as mine covers the whole spectrum.

That's another completely idiotic statement because I use a flywheel as a convenient example, that's all, and I am expecting your brain to be able to process that and understand it.  Obviously, I was expecting too much from you.

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And yet your question is based around such a device lol.

No, it is not based around an "ideal energy source."  That is a meaningless term and if you are going to talk about this stuff then you have to use the proper terminology whether you like it or not.  Failing to use the proper terminology and demonstrate a mastery over basic energy concepts makes you look like a fool.

Yes, there is no such thing as an "ideal energy source" and if you stated that in a physics or engineering class everybody would look at you like you were from Mars.  Failure to think one more time Brad.

In the realm of what we are discussing you have the following:

Ideal voltage source
Ideal current source
Ideal torque source
Ideal angular velocity source
Ideal force source
Ideal linear velocity source

That is the deck of cards laid out for you.  If in the future you continue to use the term "ideal energy source" you will look like a complete idiot.

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You never managed to provide an example of a voltage source that dose not contain energy -but no surprise there

Failure to think again Brad.

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You never like answering questions asked of you either-->like,when is an inductor resonating?,and when is it just ringing down at it's resonant frequency?.
I mean,we have all discussed this on many occasions,and TK has shown a coil ringing down,and a coil resonating many times. But you will not answer those two question's,as you know that means that your self resonating wine glass and bell theory will fall in a big heap.

I don't know what profound points or questions you have to make about an LC resonator.  NOT an "inductor resonating" Brad, you have to use the proper terminology whether you like it or not.

MileHigh

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Re: MH's ideal coil and voltage question
« Reply #897 on: June 05, 2016, 07:45:21 AM »
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I asked you to describe a coil resonating,and one that is just ringing down-->what is the difference?.

Presumably you are talking about an ideal LC circuit vs. an LCR circuit that will ring down.  There is nothing special there.

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You have not provided one example where an object will resonate by it's self,and your bell,and wine glass examples have been proven to be wrong.

An LCR circuit will resonate by itself.  So will a tuning fork, a bell, and a wine glass.

Here is your "big intellectual hurdle" that you must get over Brad to not stick out of the Electronics 001 class like a sore thumb:  "Resonance" has two meanings.  Now is that so hard to get into your head?  There is the same old "driven resonance" that you always refer to and are stuck to like some poor hapless fly on flypaper.

Here is the second definition put into some easy-to-understand sentences:

For starters, keep this in mind, "An LC circuit, also called a resonant circuit, tank circuit, or tuned circuit, is an electric circuit consisting of an inductor, represented by the letter L, and a capacitor, represented by the letter C, connected together. The circuit can act as an electrical resonator, an electrical analogue of a tuning fork, storing energy oscillating at the circuit's resonant frequency."

Now, here we go:

An LC circuit is a resonant circuit that acts as an electrical resonator that resonates at the resonant frequency and manifests the phenomenon of resonance.

A tuning fork is a resonant system that acts as a mechanical resonator that resonates at the resonant frequency and manifests the phenomenon of resonance.

A wine glass is a resonant system that acts as a mechanical resonator that resonates at the resonant frequency and manifests the phenomenon of resonance.

A bell is a resonant system that acts as a mechanical resonator that resonates at the resonant frequency and manifests the phenomenon of resonance.


Now, does that register in your brain or are you just going to stick to the single definition of resonance that you understand and completely ignore the second definition of resonance that is actually the more basic and fundamental definition of what resonance really is?

Which one is it going to be?

MileHigh

MileHigh

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Re: MH's ideal coil and voltage question
« Reply #898 on: June 05, 2016, 08:05:44 AM »
Brad:

And since we have been talking about this stuff for a while where we use analogies, you should know that there are two separate systems for analogies.  There is the "force-current" analogy and the "force-voltage" analogy.

When I talk about using the analogy of the flywheel and say that putting 4 volts across the 5 Henry inductor is like putting torque on a flywheel, I am using the force-voltage analogy.  My shopping cart example was also using the force-voltage analogy.

So, there are two "analogy systems" and here is a very informative link about the two systems:

http://lpsa.swarthmore.edu/Analogs/ElectricalMechanicalAnalogs.html

That's just the way it is and people can choose whichever analogy system they want to use to discuss a given example.  If you are a real keener, you will be able to automatically pick up which system the person you are conversing with is using.

MileHigh

tinman

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Re: MH's ideal coil and voltage question
« Reply #899 on: June 05, 2016, 10:15:10 AM »
 author=webby1 link=topic=16589.msg485784#msg485784 date=1465101608]
 

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Is the air an external force?

The air is an impedance acting upon the oscillations of the bell.

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Without the air would it ring down at the same rate as with the air?

No,it would take longer for the bell to ring down,as one of the impedance's acting upon the bell has been removed.

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Is the air pressure waves you hear at the same frequency as the bell?Repeat the above questions.

Yes they are.

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So the air responding to the oscillations of the bell is reducing the amplitude of those oscillations by converting the amplitude of those oscillations into sound waves,, aka pressure waves.

That is correct.

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So the external stimuli is a negative value.

It is not a stimuli,it is an impedance.

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The system will build up to the maximum that the outside stimuli can supply,, it stores that outside input within the amplitude of the oscillation.

That is correct--that is resonance.
But with the bell,the oscillations are decreasing in amplitude,they are not building up to a maximum,and there for,there is no resonating system.

Stimuli--a thing that arouses activity or energy in someone or something.
Impedance--An analogous measure of resistance to an alternating effect, as the resistance to vibration of the medium in sound transmission.

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Can you get a coil\cap oscillating and use a zener diode to clip the peaks that are above the input voltage?  can you see the pattern on a scope?  what will the frequency of those output pulses be,, can you drop the zener to one that is lower than the input voltage,, running through a resistor,, and watch the amplitude of the coil\cap go down?

The coil and cap are a resonant system. The coil or cap will not resonate by them self.
A tank circuit will not become resonant,unless an outside force is applied to the tank system. That outside force must be maintained in order for resonance to continue. Once the outside force is removed,then the tank system will ring down to a stop.


Brad