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High School/JEE/NEET/IPhO Physics | 17-19 Yrs

PN Junction & Diodes
 
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Duration: 5.10 Min
 
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Duration: 8.54 Min
 
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Duration: 3.31 Min
 
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Duration: 3.36 Min
 
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Duration: 3.06 Min
 
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Duration: 3.17 Min
 
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Duration: 3.35 Min
 
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Module - 12 Zener Breakdown
Duration: 3.27 Min
 
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Duration: 4.16 Min
 
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Module - 14 Zener Diode
Duration: 4.54 Min
 
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Duration: 3.12 Min
 
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Duration: 4.18 Min
 
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Duration: 4.08 Min
 
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Duration: 5.21 Min
 
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Duration: 6.28 Min
 
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Duration: 7.05 Min
 
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Duration: 7.09 Min
 
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Module - 22 Bridge Rectifier
Duration: 5.14 Min
 
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Module - 23 Photo Diode
Duration: 4.51 Min
 
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Duration: 7.52 Min
 
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Module - 25 Solved Example-1
Duration: 2.00 Min
 
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Module - 26 Solved Example-2
Duration: 2.25 Min
 
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Module - 27 Solved Example-3
Duration: 4.31 Min
 
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Module - 28 Solved Example-4
Duration: 3.14 Min
 
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Module - 29 Solved Example-5
Duration: 4.11 Min
 
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  1.  
  2. Sir you have told in this video that photodiode is used in forward bias but ncert says(page no. 487) that photo diodes are preferably used in the reverse bias condition. Not only this ncert has even asked a question also(Solved Example 14.6, page no. 487) , which is as follows - The current in the forward bias is known to be more than the current in the reverse bias. What is the reason then to operate the photodiodes in reverse bias? And there is a well explained answer for this on the same page of ncert.
    4 years ago by
    Ans 1 ->
    -Hemant Jakhar
    4 years ago by
    Ans 2 ->
    Moreover, if we follow the mechanism mentioned in ncert and apply it in forward bias condition....it seems that the current in forward bias condition should decrease instead of increasing. Although that decrease in current will of order of micro ampere while current in forward bias is of order of milli ampere. So I think it will be very hard to detect it in forward bias graph scale. Sir , please clarify... -Hemant Jakhar
    4 years ago by
    Ans 3 ->
    In other words (i.e. in words of explanation for the above question on page 487-488 of ncert), it can be inferred that fractional change in reverse bias condition will much greater (and will be positive),as it is evident that reverse bias current is increasing with increase in incident light ray intensity. And furthermore from that explanation(in ncert) I have speculated that in case of forward bias, fractional change in forward bias current will be negative and very very small in magnitude. Sir pls check and correct me if I am wrong. Yours , Sincerely -Hemant Jakhar A small physics teacher in CLC sikar. By the way Sir, I am great fan of yours. Your are such great teacher and teach with such a clarity. Thank you for providing with such beautiful physics video lectures.
    4 years ago by

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  3.  
  4. Sir, you have explained the working of a photodiode when the light sensitive junction diode is made to absorb the incident light....But the NCERT book has considered the junction diodeto be connected in reverse bias and it also states that reverse bias connection is preferred over the forward bias connection....Sir, I did not understand the reason for the above statement of the NCERT.... Hope you will clear address to my query.... Thank you sir.
    6 years ago by

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  5.  
  6. sir i have read in ncert that photo diode is operated under reverse bias but here its under forward bias how?
    9 years ago by kartik sharma

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