Draw a labelled diagram of a Zener diode as a voltage regulator.

With reference to semiconductor devices, define a $p$-type semiconductor and a Zener diode. What is the use of Zener diode?

The forward characteristic curve of a junction diode is shown in the figure :

Calculate the resistance of the diode at

(i) $V=0·5 V$

(ii) $I=60 mA$

What is the advantage of an LED bulb over filament bulb?

In a semiconductor diode, what is meant by a potential barrier?

Draw a labelled diagram of a Zener diode as a voltage regulator.