File:Negative Differential Resistance Definition.svg : Soft.lk - A Premium Software Developers - Meet one of the most powerful and intuitive POS systems for retail in Sri Lanka

This is equal to the slope of the line tangent to the graph at that point

r_{\text{diff}}(P)={\frac {\Delta v}{\Delta i}}={\frac {v_{2}-v_{1}}{i_{2}-i_{1}}}\,

Since

\Delta v>0\,

and

\Delta i<0\,

, therefore

r_{\text{diff}}<0\,

the differential resistance is negative at point P.

Date 5 June 2013 Source Own work Author Chetvorno

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	Date/Time	Dimensions	User	Comment
current	05:04, 18 July 2013	362 × 238 (17 KB)	Chetvorno	Tweaked size of labels and shape of curve
	20:53, 13 June 2013	362 × 238 (17 KB)	Chetvorno	Tweaked graph shape, reduced size of point P
	20:43, 13 June 2013	362 × 238 (17 KB)	Chetvorno	Reduced size of font
	23:27, 11 June 2013	362 × 238 (17 KB)	Chetvorno	Tweaked shape of curve, added arrowheads to emphasize directions of Δ''v'' and Δ''i''
	07:39, 10 June 2013	414 × 287 (18 KB)	Chetvorno	Changed shape of curve to clarify
	03:47, 6 June 2013	624 × 386 (19 KB)	Chetvorno	Rearranged graph to fit in Δv and Δi
	18:11, 5 June 2013	624 × 383 (17 KB)	Chetvorno	Changed style of guidelines
	18:09, 5 June 2013	624 × 383 (17 KB)	Chetvorno	Changed style of guidelines
	10:46, 5 June 2013	624 × 383 (17 KB)	Chetvorno	Reduced height of graph to save space
	09:46, 5 June 2013	632 × 442 (17 KB)	Chetvorno	{{Information \|Description ={{en\|1=Graph of the en:characteristic curve of an electrical device with en:negative differential resistance ''((<font color="red">red</font> portion of curve)'', showing how negative differential resistance i...