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Physics Question on Semiconductor electronics: materials, devices and simple circuits

In breakdown region, a Zener diode behaves as a

A

constant current source

B

constant voltage source

C

constant resistance source

D

constant power source

Answer

constant voltage source

Explanation

Solution

When the reverse voltage across a zener diode exceeds the breakdown voltage VZ,V_{Z}, the current increases very sharply. In this region, the curve is almost vertical. It means voltage across zener diode is constant at VZ, V_{Z}, even though the current through it changes. Therefore, a zener diode behaves as a constant voltage source.