Explain how a p-n junction functions as a rectifier, Physics

Assignment Help:

Explain physically how a p-n junction functions as a rectifier.

Ans: When a P-N junction diode is forward-biased and applied voltage is increased from zero, hardly any current flows through the device in beginning. It is so as external voltage is being opposed by the internal barrier voltage VB whose value is 0.7 V

For Silicon and 0.3 V for Ge. As soon as VB is neutralized, current through diode increases rapidly with increasing applied battery voltage. So, in forward bias condition, P-N  junction  diode  behaves  just like  a  closed  switch.  When  a  P-N  junction  diode  is reverse  biased,  majority  carriers  are  blocked  and  only  a  small  current  (because of minority carriers)  flows  through  the  diode.   It's  of  the  order  of  Nano amperes  (nA)  for  Si  and microamperes (µA) for Ge. For all practical purposes, this current is almost negligible. So, in Reverse bias condition, P-N junction diode behaves like an open switch. So, above discussion shows that the P-N junction functions as a rectifier.

 


Related Discussions:- Explain how a p-n junction functions as a rectifier

Newton's law of gravitation, Newton's Law of Gravitation In 1687, Newto...

Newton's Law of Gravitation In 1687, Newton did not "discover" gravity but he did figure out that gravity is universal. It makes a ball fall when you drop it on earth. It also

Circular motion, what happens to a conical pendulum when the bob splits int...

what happens to a conical pendulum when the bob splits into two parts such that one part remains attached to the string?

What is the moment of inertia about the basketball, A basketball player spi...

A basketball player spins a basketball with a radius of 15 cm on his finger. The mass of the ball is 0.75 kg. What is the moment of inertia about the basketball?

Calculate the temperature distribution in the channel, Water at 10 Celsius ...

Water at 10 Celsius flows at uniform velocity of 0.1 m/sec into a parallel plate channel, which is wide in the third direction. The parallel plates are at 20 Celsius and are 1.0 cm

Cyclotone, what is cyclotone and its uses or its application

what is cyclotone and its uses or its application

Nicol prism, Q.   Describes the construction of a 'Nicol Prism' and explain...

Q.   Describes the construction of a 'Nicol Prism' and explains its action in converting UPL into PPL. Sol.     Nicol Prism: This is the most simple and elegant polarizer and

Determine the critical angle and refractive index, A luminous point object ...

A luminous point object is placed at a depth of 0.5m inside a liquid. A circular patch of light of radius 0.05675 m is prepared on the surface. Determine the critical angle and re

Vector, two forces at right angle with each other have a resultant of 58kN,...

two forces at right angle with each other have a resultant of 58kN, If one of the forces is 40kN find the magnitude of the other forces

Chemistry in action - detergents, chemistry in action - Detergents A re...

chemistry in action - Detergents A result of high dissolving power, the logically happening water all time consists of dissolved matters, majorly ionic substances. Hard water h

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd