Joule Thief 101

[tinman]

I suppose that I could go out and get a post and a magnet and wrap a coil and make the magnet wobble on the post and get all excited and convince myself that I am doing stuff that is "not in your books."   

Good luck on your little junior college Physics 001 summer school lab experiment.   

P.S.:  If you get close, then watch out for the dreaded "MIBeach Ball."   

https://www.youtube.com/watch?v=I6Ffr1U7KMY

Whats the matter MH?; still got your knickers in a twist because i proved you wrong on many occasions in this thread.
Well i dont really care how you try and twist things around to try and correct yet another mistake,the fact is-you are wrong,resonance is not the wine glass oscillating at its natural resonant frequency --resonance is an interaction between an outside force acting on another component where the outside force causes that component to oscillate at its natural resonant frequency.

What poynt said was wrong. A wine glass oscillating at its natural resonant frequency is 'not'resonance',as there is no outside force interaction,and there for there is no resonance. We tap the wine glass,it will oscillate and ring down to a stop.
Resonance is not oscillation-period.


Brad

[MileHigh]

I can tell you what I think Brad although I am not educated in these matters:  It's the Dunning-Kruger effect combined with a strong OCD related to being wrong and perceived as being wrong.

[Johan_1955]

I can tell you what I think Brad although I am not educated in these matters:  It's the Dunning-Kruger effect combined with a strong OCD related to being wrong and perceived as being wrong.

Sorry to hear, but that is Karma, mirror was working!
But very good that you did find it out, is there a cure, are you're kids affected!

Strength, and fast healing progress to you, we need you're old one back!!

Hugz, Johan

[tinman]

I can tell you what I think Brad although I am not educated in these matters:  It's the Dunning-Kruger effect combined with a strong OCD related to being wrong and perceived as being wrong.

It is so funny to watch you scramble to find a way out of !yet! another blooper MH.
So ofter you guys(the guru's) tell us experimenters to go read book's,and search the web for correct answers,and when we do,and those answers are not what you want it to be,the bullshit starts---happens all the time.

Well here is the true definition of resonance as physics see it.
Definition of Resonance - "The increase in amplitude of oscillation of an electric or mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system.

http://www.physicsclassroom.com/class/sound/Lesson-5/Resonance
Resonance
As was mentioned in Lesson 4, musical instruments are set into vibrational motion at their natural frequency when a person hits, strikes, strums, plucks or somehow disturbs the object. Each natural frequency of the object is associated with one of the many standing wave patterns by which that object could vibrate. The natural frequencies of a musical instrument are sometimes referred to as the harmonics of the instrument. An instrument can be forced into vibrating at one of its harmonics (with one of its standing wave patterns) if another interconnected object pushes it with one of those frequencies. This is known as resonance - when one object vibrating at the same natural frequency of a second object forces that second object into vibrational motion.
The word resonance comes from Latin and means to "resound" - to sound out together with a loud sound. Resonance is a common cause of sound production in musical instruments. One of our best models of resonance in a musical instrument is a resonance tube (a hollow cylindrical tube) partially filled with water and forced into vibration by a tuning fork.

https://en.wikipedia.org/wiki/Resonance
In physics, resonance describes when a vibrating system or external force drives another system to oscillate with greater amplitude at a specific preferential frequency.

http://www.dictionary.com/browse/resonance
the state of a system in which an abnormally large vibration is produced in response to an external stimulus, occurring when the frequency of the stimulus is the same, or nearly the same, as the natural vibration frequency of the system.

https://en.wikibooks.org/wiki/A-level_Physics_(Advancing_Physics)/Resonance
Resonance occurs when an oscillating system is driven (made to oscillate from an outside source) at a frequency which is the same as its own natural frequency.

http://www.thefreedictionary.com/Wave+resonance
Physics The increase in amplitude of oscillation of an electric or mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system.
(General Physics) sound produced by a body vibrating in sympathy with a neighbouring source of sound.

http://www.ldoceonline.com/Physics-topic/resonance
technical   sound that is produced or increased in one object by sound waves from another object

http://physicsnet.co.uk/a-level-physics-as-a2/further-mechanics/forced-vibrations-resonance/
If an object is being forced to vibrate at its natural frequency, resonance will occur and you will observe large amplitude vibrations. The resonant frequency is fo.

http://www.yourdictionary.com/resonance
reinforcement and prolongation of a sound or musical tone by reflection or by sympathetic vibration of other bodies
the current or voltage flow is at maximum amplitude, produced when the frequency of the electrical source is varied, or
the current or voltage is in phase respectively with the applied current or voltage, or
the natural frequency of the circuit is the same as that of the incoming signal

http://www.oxforddictionaries.com/definition/english/resonance
Physics The reinforcement or prolongation of sound by reflection from a surface or by the synchronous vibration of a neighbouring object.
Mechanics The condition in which an object or system is subjected to an oscillating force having a frequency close to its own natural frequency.

And the list go's on and on--and they all say the same thing.
Hooray for your books MH,they just proved your ass wrong.
And do you know what that means MH--yep,thats right,my answers were correct MH,and yours were not-->aint that a hoot

So no-resonance is not an object oscillating at it's natural frequency.
Resonance is as stated above-in every link.

Go and do your home work MH--get into them beloved book's ,and do some reading of your own---and stop leading people down your garden path--as all your flowers are dead.


Brad.

[MileHigh]

Brad:

Yes I know, there is a level of subtlety there in what you are linking to that escapes you.  All of those links use the most readily understandable way of describing resonance to effectively get the idea across, that being that "resonance" is the response of a resonant system to an external stimulating frequency.  It is the way to get the concept across to someone that has never used the word before and does not understand what in means.  In fact, it is obvious that "resonance" can indeed mean just that, "the increased response of a resonant system to an external stimulating frequency at the resonant frequency."

However, like I already told you, words can have more than just one meaning, and latching onto one meaning of a word like you are doing, and then trying to claim or pretend that other related definitions of the word are invalid is a totally ridiculous thing to do.  And that's what you are doing right now, and it is clearly not the first time you have attempted to do something like this.

Let's take a look at your first quote:

Definition of Resonance - "The increase in amplitude of oscillation of an electric or mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system."

Now let's break it down and simplify it and look into it a bit more deeply.

>>> The increase in amplitude of oscillation of a mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system.

Now let's substitute "whose frequency is equal or very close to the natural undamped frequency" for "resonant frequency."

>>> The increase in amplitude of oscillation of a mechanical system exposed to a periodic force at the resonant frequency of the system.

Let's substitute "increase in amplitude of oscillation" for "resonating."

>>> The resonating of a mechanical system exposed to a periodic force at the resonant frequency of the system.

We know that the "mechanical system" is in fact a "resonator."

>>>  The resonating of a resonator exposed to a periodic force at the resonant frequency of the system.

The resonator exhibits the property of resonance.  We can say that "resonance" is the process where a resonator resonates at the resonant frequency.  For example you can say, "the resonator is in a state or resonance" when it is vibrating at the resonant frequency.

So, "resonance" also means "a resonator resonating at the resonant frequency."

Also, "being in a state of resonance" means "a resonator resonating at the resonant frequency."

Notice that there is a no "exposed to a periodic force" anymore.  You don't need it.

"Resonance" is a word that describes a mechanical or electrical system resonating at the resonant frequency.  A classic example is the wine glass.  You strike it once and then it is a resonant system that is resonating at the resonant frequency.  You can say "self-resonant frequency" or "resonant frequency" they are synonymous.

A stand-alone wine glass can be a resonator resonating at the resonant frequency - it is in a state of resonance.

So your clinging onto the first definition that you see for "resonance" and pretending that there are no other definitions of the word to "prove me wrong" is ridiculous.  It's just one more in a long long list of ridiculous statements that you have made in this thread.

MileHigh