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Author Topic: Teaching impedance  (Read 940 times)

David Shriver

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Teaching impedance
« on: February 06, 2014, 02:08:37 pm »

Hello everyone,

I have a very sharp HS intern.  I was trying to explain impedance to her and I quickly discovered that I understand it well enough for myself but not well enough to really explain it or teach it.  Can someone point me to some resources for teaching this concept?

-d
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Ivan Beaver

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Re: Teaching impedance
« Reply #1 on: February 06, 2014, 03:01:34 pm »

Hello everyone,

I have a very sharp HS intern.  I was trying to explain impedance to her and I quickly discovered that I understand it well enough for myself but not well enough to really explain it or teach it.  Can someone point me to some resources for teaching this concept?

-d
It depends on how deep you want to go-but here is a starter.

Resistance is the opposition to the flow of DC current.

Impedance is the opposition to the flow of AC current and has 3 elements-resistance-inductance and capacitance-each which has its own phase aspect.

These 3 will add/subtract together (depending on the phase) to give a final impedance number.

This could be either purely resistive-capacitive or inductive or any combination of them.
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Jason Glass

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Re: Teaching impedance
« Reply #2 on: February 06, 2014, 03:23:37 pm »

Hello everyone,

I have a very sharp HS intern.  I was trying to explain impedance to her and I quickly discovered that I understand it well enough for myself but not well enough to really explain it or teach it.  Can someone point me to some resources for teaching this concept?

-d

Hi David,

This is 28 minutes long and the very best demonstration that I have seen: http://techchannel.att.com/play-video.cfm/2011/3/7/AT&T-Archives-Similarities-of-Wave-Behavior

To fully understand impedance, one must understand the fundamentals of wave behavior.  The video shows this brilliantly.

Frank Koenig

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Re: Teaching impedance
« Reply #3 on: February 06, 2014, 11:49:39 pm »

Hello everyone,

I have a very sharp HS intern.  I was trying to explain impedance to her and I quickly discovered that I understand it well enough for myself but not well enough to really explain it or teach it.  Can someone point me to some resources for teaching this concept?

-d

The "Radio Amateur's Handbook", published by the American Radio Relay League, has about the best treatment I've seen of elementary circuit concepts that does not rely on complex variables (much) or calculus. It hardly matters what edition, they all have the basic circuit stuff.

--Frank
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Tim McCulloch

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Re: Teaching impedance
« Reply #4 on: February 07, 2014, 12:09:10 am »

Hi David,

This is 28 minutes long and the very best demonstration that I have seen: http://techchannel.att.com/play-video.cfm/2011/3/7/AT&T-Archives-Similarities-of-Wave-Behavior

To fully understand impedance, one must understand the fundamentals of wave behavior.  The video shows this brilliantly.

Great stuff, Jason.  Thanks for the link.
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Jordan Wolf

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Re: Teaching impedance
« Reply #5 on: February 07, 2014, 08:51:59 am »

Jason,

That video was great!  Thanks for the link.
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David Shriver

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Re: Teaching impedance
« Reply #6 on: February 07, 2014, 11:15:39 am »

Thanks Jason!!

Hi David,

This is 28 minutes long and the very best demonstration that I have seen: http://techchannel.att.com/play-video.cfm/2011/3/7/AT&T-Archives-Similarities-of-Wave-Behavior

To fully understand impedance, one must understand the fundamentals of wave behavior.  The video shows this brilliantly.
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Luke Geis

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Re: Teaching impedance
« Reply #7 on: February 12, 2014, 09:27:18 pm »

" If you can't explain it simply, then you don't understand it well enough " Albert Einstein...........

Great links for the answer.
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