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zener resistance of a zener diode is the resistance of the zener diode
but which is the resistance of a diode
Zener diode is heavily doped pn junction diode.
zener diode :
zener diode operates under reverse bias voltage
ideal diode :
ideal diode operates under forward bias voltage
A zener diode cannot be used as switch.
Dr. Clarence Melvin Zener of Southern Illinois University invented the zener diode.