# Talk:Negative resistance

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## Figure 1

What is the horizontal axis showing? This page is for the general public so why do you use eV and not Joule? — Preceding unsigned comment added by Jangirke (talkcontribs) 04:23, 7 February 2014 (UTC)

I've always thought that diagram was not useful for this article. We just need the simple I-V plot. There are three different plots there, it is entirely unclear what all the axes of the plots represent, and most of it is irrelevant to the central focus of this article. I know there has been some discussion and to and fro with different lead diagrams in the past but it could still do with another debate. SpinningSpark 16:27, 8 February 2014 (UTC)

## confusing section about entropy relation.

That is, current will always flow from higher voltage to lower voltage, and (at least with I≠0 and V≠0) the quantity V/I will be positive. Please explain what you mean with this statement? — Preceding unsigned comment added by Jangirke (talkcontribs) 04:42, 7 February 2014 (UTC)

Please do not sprinkle tags in articles without first engaging on the talk page. There is no paragraph in any article that someone would not find "confusing".
The "Entropy consideration" section was added on 19 January 2014 (diff) and I think it should be sourced or removed. It's making the point that a simplistic analysis of "negative resistance" may suggest that such a device could be used to generate perpetual motion, however a power supply is needed. Transistor does not make a big deal of the fact that a power supply is needed, and I think the attempt to "explain" what is going on by referring to entropy is unhelpful. The article should state that a power supply is needed, but that's all. Johnuniq (talk) 05:26, 7 February 2014 (UTC)

I removed the section. If there's a source available, we could put it back and talk about how to tune it up, but without one it seems like just synthesis. Dicklyon (talk) 06:14, 7 February 2014 (UTC)

I don't think there was anything especially controversial in the material you removed. There is a fundamental difference between differential negative resistance, like a tunnel diode (which is essentially just a non-linear resistor from a network theory point of view and absorbs power into the one-port just like a regular resistor) and a negative resistance simulator, like an NIC (which is actually delivering power out of the one-port). Personally, I find the I-V quadrant view very instructive in illuminating this difference. I am not sure that it is entirely necessary to invoke entropy (conservation of energy is enough) but this book uses exactly that approach (ie entropy and quadrants). Also, this book talk about negative resistance, quadrants and power flow in regard to solar cells. SpinningSpark 16:09, 8 February 2014 (UTC)

## Missing an implementation?

If I am correct the Lambda diode is missing. - Regards Snaily (talk) 14:48, 13 July 2014 (UTC)