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| Keywords: Negative differential resistance definition.svg characteristic curve of an electrical device with negative differential resistance <font color red >red</font> portion of curve showing how negative differential resistance is defined The differential resistance r<sub>diff</sub> at a point P on the curve is equal to the inverse slope of the curve at that point <math>r_\text diff P dv \over di P \ </math> This is equal to the slope of the line tangent to the graph at that point <math>r_\text diff P \frac \Delta v \Delta i \frac v_2 - v_1 i_2 - i_1 \ </math> Since <math>\Delta v > 0 \ </math> and <math>\Delta i < 0 \ </math> therefore <math>r_\text diff < 0 \ </math> the differential resistance is negative at point P own Chetvorno 2013-06-05 Negative resistance Device current-voltage characteristics Cc-zero | ||||
