MH's ideal coil and voltage question

[tinman]

Whether right or wrong, decaying oscillations of a resonant system are often referred to as still resonating.

That is incorrect Poynt.
Show me just one video of a coil ringing down,where the operator says the coil is resonating.
Even in normal every day speech,do we say the bell is ringing or resonating?.
An object resonates when is is oscillating at a continuous maximum amplitude.

By the definition given in the attachment, an LC circuit is a resonant system, as is also an air resonant cavity.

That is correct.
When will the LC circuit resonate,and when is it said to be ringing down?

I suspect that everything that can resonate has an energy exchange process within itself, even after the stimulus is removed.

Yes,and that is due to the physical size,shape,and elasticity values of the object.


Brad

[tinman]

From HyperPhysics:

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/reson.html#resdef

[The first definition that they give:]

Resonance

In sound applications, a resonant frequency is a natural frequency of vibration determined by the physical parameters of the vibrating object. This same basic idea of physically determined natural frequencies applies throughout physics in mechanics, electricity and magnetism, and even throughout the realm of modern physics.

[The second definition that they give, the one you are obsessing on:]

Ease of Excitation at Resonance

It is easy to get an object to vibrate at its resonant frequencies, hard at other frequencies. A child's playground swing is an example of a pendulum, a resonant system with only one resonant frequency. With a tiny push on the swing each time it comes back to you, you can continue to build up the amplitude of swing. If you try to force it to swing a twice that frequency, you will find it very difficult, and might even lose teeth in the process!

And those two examples agree with what i am trying to tell you.]
Do you not read and understand the difference between an object oscillating at it's natural frequency,and resonating.



Brad

[MileHigh]

Do you not read and understand the difference between an object oscillating at it's natural frequency,and resonating.

Brad

There is no difference, they are synonymous.

[tinman]

 author=MileHigh link=topic=16589.msg485815#msg485815 date=1465151477]

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.

Provide just one video of an LC circuit ringing down,where the operator says it is resonating.

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 tuning fork will vibrate at it's natural frequency when struck once--it is not resonating.

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 wine glass will ring at it's natural frequency when struck once--it is not resonating.

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

A bell will ring at it's natural frequency when struck once--it is not resonating.

Brad

[MileHigh]

Burn this into your psyche Brad:  A tuning fork is an acoustic resonator.  It resonates at a specific constant pitch when set vibrating by striking it against a surface or with an object.