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

Orbital velocity for low earth orbit, Q. Orbital Velocity for Low Earth Orb...

Q. Orbital Velocity for Low Earth Orbit Neglecting air friction an object will sustain a low altitude orbit when the centrifugal force due to its motion in a circular orbit is

Matter, trying to find out what matter stands for such as M=mass but do not...

trying to find out what matter stands for such as M=mass but do not know the other letters

Explain retina, Retina It is inner most and sensitive layer. It receive...

Retina It is inner most and sensitive layer. It receives images of near and far objects.

Motion on inclined plane, a body is thrown horizontally with a velocity of ...

a body is thrown horizontally with a velocity of u from the top of a tower. the displacement of the stone when the horizontal and vertical velocities are equal is

Majority and minority charge carriers , Majority and minority charge carrie...

Majority and minority charge carriers  A pure semiconductor has equal number of holes and electrons. But an extrinsic semiconductor has majority charge carriers. When a tri

Heat loss in a cylindrical pipe, The project consists of a word processed (...

The project consists of a word processed (typed) report submitted by the project report due date. Late submissions are penalized 10% of the mark per day, including Saturdays and Su

Calculate the thickness of the film, Q. A light of wavelength 58900A falls ...

Q. A light of wavelength 58900A falls normally on a thin air film, 6 dark fringes are seen between two points. Calculate the thickness of the film. 2μt = nλ Thickness of th

Explain the conservation of energy, Conservation of Energy Conservation...

Conservation of Energy Conservation of energy is not all about turning off the computer when you are not using it. Energy is not created or destroyed, it just changes forms. En

What is electrostatic shielding, Q. What is electrostatic shielding? i...

Q. What is electrostatic shielding? i) It is the method of isolating a certain region of space from external field. ii) It is basis on the fact that electric field inside a

Explain squirrel cage induction motors, Mines Flame proof squirrel cage...

Mines Flame proof squirrel cage induction motors are used in coal mine.

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