(ii)Zener diode:

(a) The junction diode made of Si or Ge, whose reverse resistance is very high, is known as Zener diode.

(b) It works at Zener voltage (Vz) i.e. the voltage at which breakdown starts.

Zener voltage (Vz): The voltage at which breakdown starts in Zener diode and consequently the reverse current in the circuit abruptly increases, is defined as Zener voltage.

(c)It is used in power supplies as a voltage regulator.

(d)Symbolic representation of Zener diode.

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