Write the uses of photo diode.

Explain, with the help of a circuit diagram, the working of a photo diaode. Write briefly how it is used to detect the optical signals.

The forward characteristic curve of a junction diode is shown in figure below: Calculate the resistance of the diode at: I= 60mA

A Zener diode is fabricated by heavily doping both p- and n-sides of the junctions. Explain, why ? Briefly explain the use of zener diode as a dc voltage regulator with the help of a circuit diagram.

What is the use of a Zener diode?

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

In a p-n junction photo cell, the value of the photo electromotive force produced by monochromatic light is proportional to

A zener diode having breakdown voltage equal to 15V, is used in a voltage regulator circuit shown in figure. Find the current through the diode.

The figure below shows the V-I characteristic of a semiconductor diode. (i ) Identify the semiconductor diode used. (ii) Draw the circuit diagram to obtain the given characteristic of this device. (ii) Briefly explain how this diode can be used as a voltage regulator.

Assuming that the junction diode is ideal the current through the diode is :-

In the emission of photo-electrons, the number of photo-electrons emitted per unit time depends upon the