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

Sievert, Sievert; Sv: The derived SI unit of dose equivalent, explaine...

Sievert; Sv: The derived SI unit of dose equivalent, explained as the absorbed dose of ionizing radiation multiplied through internationally-agreed-upon dimensionless weights,

What is the spacing, A 350-Hz tuning fork is held over the end of a pipe th...

A 350-Hz tuning fork is held over the end of a pipe that is inserted into water. What is the spacing between the resonance lengths of the pipe if the speed of sound is 348 m/s

PHYSICAL CHEMISTRY, Calculate the density of sodium metal. The length of th...

Calculate the density of sodium metal. The length of the body-centered cubic unit cell is 4.24 A.

Find refractive index by using total internal reflection, Q. Illustrate how...

Q. Illustrate how do you find the refractive index of a liquid by using total internal reflection? Answer:- Using Snell's law n (1) = (n (2) x sin angle (2)) / sin angl

Inductors in dc circuits, Inductors in dc circuits: If it is required t...

Inductors in dc circuits: If it is required to increases the value of inductance in a circuit, then two or more inductors may be connected in series.  The total inductance then

Light, how do we see light?

how do we see light?

Explain the applications of polarization of light, Explain the applications...

Explain the applications of polarization of light?  Write any four applications of interference of light. Illustrate how plane polarized light obtained by reflection.

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