Question

zener diode ? why in reverse bised ?

Answer 1

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➡️Zener Diode is a form of semiconductor diode in which at a critical reverse voltage a large reverse current can flow.

➡️The applied d.c. voltage that prevents or greatly reduces current flow in a diode, transistor, etc. 

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Answer 2

The Zener diode is like a general-purpose signal diode.

When biased in the forward direction it behaves just like a normal signaldiode, but when a reverse voltage is applied to it, the voltage remains constant for a wide range of currents. Avalanche Breakdown: There is a limit for the reversevoltage.