Expression for dynamic resistance of the diode(Repeatedly asked)

Expression for dynamic resistance

Dunamic resistance is defined as the ratio of change in current at a particular point of operation. It is basically the reciprocal of the slope of V-I characteristics at a particular point of application and denoted by rd.

rd = VD/ID = 1/slope= 1/(dI/dV)= dV/dI-------------------1

We know that the diode voltage current relationship is obeyed on the V-I characteristics at a particular point of application ,