Talk:Output impedance

internal resistance
There is no clear explanation of what internal resistance is. I'll try and find the source we used in my AS physics classes, where it was modelled as a resistor within the battery, so to speak ... 172.202.214.197 14:48, 19 February 2007 (UTC)

I still don't understand what an output impedance is. Can someone explain or clarify this load of jargon? User:195.144.132.66


 * It's kind of hard to explain. Any real device that creates electricity can be modeled as a perfect voltage or current source and some impedance in series with it.  That's probably too technical.   — Omegatron 23:53, 19 September 2005 (UTC)
 * I think it's useful to introduce the concept of generator superposition theorem, then we can use a fictive voltage source, then measure the current, then divide voltage over current. Correct me if I'm wrong. — Preceding unsigned comment added by Diraniyoussef (talk • contribs) 19:08, 17 January 2021 (UTC)

I'm surprised we don't have an article on the two-port model. Input/output impedance might make better sense when covered together. - mako 06:49, 28 January 2006 (UTC)


 * Might be a good idea. — Omegatron 15:25, 27 July 2006 (UTC)


 * Or just link to Thevenin_theorem or Norton_theorem --63.250.137.14 (talk) 17:39, 29 October 2008 (UTC)

Is it useful to introduce another way to calculate the internal resistance of a battery ? E.g. we short circuit the battery (of course theoretically or else it'll burn) then it's the Vs / I. Also, how about drawing the characteristic of a battery ? — Preceding unsigned comment added by Diraniyoussef (talk • contribs) 18:58, 17 January 2021 (UTC)

CHEMISTRY
No attempt to even connect this to chemistry (especially in batteries, with concepts such as polarization of the electrodes perhaps)

130.130.37.13 (talk) 06:15, 21 October 2008 (UTC)connecting with battery chemistry too far derived from the idea of an output impedance, not relevant

Worse yet! The internal resistance of a battery depends as much on the size and internal construction of the battery as it does on the chemistry. The internal resistance of an alkaline D cell is much less than the internal resistance of an alkaline AAA cell or a tiny alkaline button cell. Somebody who cares can look up the data sheets for some real batteries on http://data.energizer.com/. 151.201.225.237 (talk) 20:35, 10 January 2009 (UTC)

Output impedance
The article never uses the term "output impedance". It does use "internal resistance" repeatedly. So why is the article called "output impedance" with a redirect from "internal resistance"? Shouldn't it be the other way around? 219.89.174.125 (talk) 23:19, 22 December 2008 (UTC)

Measuring the "internal resistance" of a battery.
The article says, "it is impossible to directly measure the internal resistance of a battery." But, it is impossible to directly measure the resistance of any device. Resistance is always measured as a ratio of (change in) voltage to (change in) current. What the author probably meant to say, is that an ohm meter (or the ohms setting on a multimeter) can not be used to measure the resistance of a battery because such meters are designed with the assumption that the only voltage source in the test circuit is the source contained within the meter itself. Such meters do not correctly account for the open-circuit voltage of the battery. 151.201.225.237 (talk) 20:28, 10 January 2009 (UTC)

Problem
Initially this article contained material on internal resistance, which was wrong because Output Impedance is not internal resistance. So, I had shifted the article to Article "Internal Resistance" The output impedancec article should eventually look like the input impedance article. I had asked to delete it until someone creates it, but it was rejected and redirected back to internal resistance. Then I had to add the single-line-definition to remove the wrong re-direct. Now people want to transfer it to wikitionary!!!!!! Nobody is bothered to build the article. They only want to bully upon... —Preceding unsigned comment added by Vayalir (talk • contribs)
 * Instead of attacking other editors, and reverting with edit summaries about Wiktionary, why didn't you just leave it until you could build an article? You could have built in in your webspace with references if you couldn't do it on your own PC. That would have been a trouble-free way to do it. How about adding some content here -- on this page, to see what you think it should look like? Dougweller (talk) 17:50, 3 April 2009 (UTC)

Sand-text (Expiring on correction of article):

Output impedance of any circuit or device ""in general"" is the Thevenin impedance as seen at the output terminals of the circuit or device, i.e., the impedance which in series with an ideal source in the Thevenin equivalent of the circuit(Thevenin's equivalent being the representation of any circuit as an ideal source in series with an impedance).

When the circuit under consideration as a whole is a source, then the output impedance of that source ""CAN"" be referred as internal resistance.

So, an internal resistance can be referred as output impedance, but (not all) O/P imp. can be referred as internal resistane. Vayalir (talk) 05:35, 4 April 2009 (UTC)

Also, when we say output impedance, it adds up the internal resistance of all sources in the circuit under consideration along with other impedances.(These sources are actully sub-circuits with their own O/P impedance which is their internl resistance, but are black-boxes for the circuit under consideration)Vayalir (talk) 05:39, 4 April 2009 (UTC)

Rewrite article
I don't understand this discussion of moving this article to wiktionary. It's an important concept in electronics, and should be in Wikipedia. I've done some improvements and enlarged the article somewhat. But it's still a stub, we need more help. And please help me correct things which I may have misunderstood – I'm not an expert, but I know some. Mårten Berglund (talk) 20:06, 3 April 2009 (UTC)
 * That's great. As a definition, it didn't belong here. As an article, it does. Now it is more than a definition. Dougweller (talk) 21:07, 3 April 2009 (UTC)
 * Thanks. If someone could fix a figure, would be nice though. Mårten Berglund (talk) 00:44, 4 April 2009 (UTC)

yeah, it seems better but needs correction, read the sand text above...also you have written "sometimes referred as internal resistance of the CIRCUIT" but the internal resistance link is again re-directing to article internal resistance of a SOURCE! Vayalir (talk) 05:57, 4 April 2009 (UTC)
 * I'm not an expert, but isn't it possible to view every circuit as a Thévenin circuit with a voltage source and an internal resistance? However, feel free to correct things that you believe is incorrect. Mårten Berglund (talk) 11:58, 10 April 2009 (UTC)

Translation into Chinese Wikipedia
The version 07:23, 23 March 2019‎ Mike Mounier of this article is translated into Chinese Wikipedia to expand an existing stub.--Wing (talk) 08:26, 24 October 2019 (UTC)