I think I've understood it now.In the conducting region, what is the change in voltage due to a change in current?
In this region, voltage changes but current remains the same so it is kind of current source that acts as a resistor with infinite resistance.In the non-conducting region, what is the change in voltage due to a change in current? The answer is easier to see if you think of it as what is the reciprocal of the change in current due to a change in voltage?
Yes, I see now.This function has a dynamic resistance of infinity when Vfwd is less than 0.7v, and 0 otherwise.
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by Jake Hertz