# PN Junction Diode – Interview Q & A – 2

9. What is the static resistance of a diode ?
Static resistance R of a diode can be defined as the ratio of voltage V across the diode to the current flowing through the diode.

R = V/ I

Where :
R – Static resistance of a diode
V – Voltage across the diode

I – current across the diode

10. What is the dynamic resistance ?
Dynamic resistance of a diode can be defined as the ratio of changein voltage across the diode to the change in current through the diode.

r = ∆V / ∆I

Where :
r – Dynamic resistance of a diode
∆V – change in voltage across the diode
∆I – change in current through the diode

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