Write briefly, how a Zener diode acts as voltage regulator.

Zener diode is used for:

Draw the symbol and the reverse bias I-V characterstics of a zener diode. Explain briefly, which property of the characterstics enables us to use zener diode as voltage regulator.

In figure shows the V-I characterstics of semiconductor diode. Briefly explain, how this diode can be used as a voltage regulator.

Which special type of diode can act as a voltage regulator? Give the symbol of this diode and draw the general shape of its V-I characteristics.