Reason behind why Ve decreases in the negative resistance region: As the Ve is increased the emitter current Ie is also increased and the junction behaves like a typical P-N junction. But the Ve can be only increased up to a particular point called Vp (peak voltage). At this point a considerable amount of emitter current (Ie) flows and a significant number of holes are injected into the junction. These holes are repelled by B2 and attracted by B1. As a result, the region between emitter(E) and B1 terminal starts saturating by holes and the conductivity of this region starts to increase. This phenomenon of increasing conductivity by the insertion of holes is called conductivity modulation. This increased conductivity reduces RB1 and η. This results in a condition where emitter current Ie increases and the emitter voltage Ve decreases. This situation is similar to a negative resistance scenario.
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Love your videos ... Just continue the work sir..with all due respect.. I like the way you explain on paper with summing all about the topic and reducing the time of effort for us.. take care sir.
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@@EngineeringFunda He is from TN and he's saying that the way you teach makes it very easy to understand and he's also requesting you to upload more videos like this! Cheers and Jai Hind Bhai.
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10:35 resistance increase as temperature increas ............... not like what he says in the video but steal he is right about what happen to Rb1 when the current increase
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Sir after 3rd region there will be peak point again and valley point also right? Because in your ujt as relaxation oscillator you said charging will be from valley point to peak point and discharging will be from peak point to valley point
i have one doubt sir when temperature increases the resistance should increase but u r saying decreasing , I couldn't understand could you please explain me sir !
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what u said is correct but it is according to ohms law where temperature is constant ... but here temperature will varies therefore ohms law fails here and power equation comes into play.. i.e. p=vi where power is constant ...so, voltage is inversely proportional to current....
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Reason behind why Ve decreases in the negative resistance region:
As the Ve is increased the emitter current Ie is also increased and the junction behaves like a typical P-N junction. But the Ve can be only increased up to a particular point called Vp (peak voltage). At this point a considerable amount of emitter current (Ie) flows and a significant number of holes are injected into the junction. These holes are repelled by B2 and attracted by B1. As a result, the region between emitter(E) and B1 terminal starts saturating by holes and the conductivity of this region starts to increase. This phenomenon of increasing conductivity by the insertion of holes is called conductivity modulation. This increased conductivity reduces RB1 and η. This results in a condition where emitter current Ie increases and the emitter voltage Ve decreases. This situation is similar to a negative resistance scenario.
What are you doing now? Are you doing good?
Awesome explanation sir, helped me to understand semiconductors with ease. Definitely recommend your channel to others
Your welcome 🙏
Tum jaise log bagwaan ho yaar. exam ke raat ko sab Kuch samjaadete ho
xDDD kal mera bhi exam hai. ye videos dekh kar pass toh ho hi jaunga
Suprb
Your Playlist is wonderful sir........it helps a lot .
Thank you sir❤
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sir thank you so much sir I was facing a lot of difficulty in this topic you explained well than my college professor
Your welcome 🙏
Simple and clear explaination... Thankyou so much☺
Concept clearing video 👍👍
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Thanks the world's best teacher
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Great man
U saved lot of time
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Thank you sir..
For explaining UJT working clearly.
Love your videos ... Just continue the work sir..with all due respect.. I like the way you explain on paper with summing all about the topic and reducing the time of effort for us.. take care sir.
I really like your name . God bless you
@@EngineeringFunda thanks a lot sir..
I call my son krishna
very good, very precisely explained. Congratulation
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Was able to understand the concept clearly.
I read my book after watching the video and it made my work easier.
Thank you Sir
Sir you are really great sir.......your teaching very super ellarume purinjukkaramari irukku idhemari innum neraya videos podunga sir please
Sorry dear but didn't get anything as I am Gujarati
@@EngineeringFunda He is from TN and he's saying that the way you teach makes it very easy to understand and he's also requesting you to upload more videos like this! Cheers and Jai Hind Bhai.
Thoppppp good expalnation🤩🤩🤩🤩🤩🤩
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Quality teaching...👏
Your welcome 🙏
It's very easy to understand while ur telling the topic sir . thanks for telling the topic very easy..all the best for ur more videos
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Awesome explanation
Your welcome dear 🙏
10:35 resistance increase as temperature increas ............... not like what he says in the video
but steal he is right about what happen to Rb1 when the current increase
this is a semiconductor...and semiconductor has NTC...negative temperature coefficient...so when the temp increases the resistor will decrease
Thank you very much you save me from my reporting😍🥰
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Your classes helped me a lot bro thanks for making this video lectures 👌 very simple and easy explanation
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The lecture is great indeed.
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Great Explanation 😊
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Please make a video on UJT based triggering circuit for SCR
It is already there in my playlist of Power electronics
Super explanation sir ❤️❤️
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sir you are really awesome sir
Thank you sir🙏..
U explained very easily
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Great video sir!!!
Amazing explanation
Well Explained👌👌
Love and happiness of students is my ultimate goal, God bless you 🙏, keep learning and keep progressing.
Very good explanation sir.
❤️
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Superb teaching sir
u r the best
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Thank you sir.... You explanation really helped
Love and happiness of students is my ultimate goal, God bless you 🙏, keep learning and keep progressing.
😚😚
thankyou sir.. made.my day😍
Nice video sir
So thankfull for your video sir
Really amazing explanation ❣️
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@@EngineeringFunda why emitter terminal is so close to. The base1 terminal?
very good explaination
Good explanation...thank youuuuu 🌹
Thank you very much sir for such nice explanation. 😊
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Sir u haven't explained saturation region.
Very sharp description..... Sir
It's really good
LOL🤣
Nice work sir
Your welcome
Excellent sir ,
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Excellent, clear teaching!
Nice explanation
It's really very easy to understand. Thank you for providing us such a good video.
Tum bahut aacha kam karta hai
Very nice
Your welcome 🙏
10:46 you said that the temperature increases so temperature decreases, but according to books if temperature increses then resistance also increases.
this is a semiconductor...and semiconductor has NTC...negative temperature coefficient...so when the temp increases the resistor will decrease
Thank you some much sir
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Thank you sir...
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thank you sir !
Your Appreciations, care and share matters a lot to me. #EnginneringLove.
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Thank u sir,great explanation..❤️
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Well explained.
Sir very nice
Sir super
Well done sir
Thank you. Well explained
Your welcome
Nyc
Your welcome
Sir does the resistance increase or decrease when temp rises?
Yes it effects.
Resistance increase with increase in temperature in ohmic conductor
That happens for semiconductor
Resistance will decrease when the temp is increased
Good
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Everything u said is gd.but when it comes to working of ujt ,it seems that u've manipulated how voltage z decreasing....make it clear
Very well explained sir. What is the name of the teacher please tell..?
Hitesh Dholakiya
Great
Sir your lectures are very cool...Can you suggest book(s) to read about power electronics as I am a beginner(competitive Exam level).
For power electronics Salman rasdi
Dr. R. S. Sedha (Electronics)
Anyone from DU here ?....
@@jharkhandgeetsangeet3438 yeah
Sir after 3rd region there will be peak point again and valley point also right? Because in your ujt as relaxation oscillator you said charging will be from valley point to peak point and discharging will be from peak point to valley point
Yeah
Sirr in last u apload these concepts notes after completion of video
Thanks sir
thank u so much sir
Thank you sir.its really helpfull
Does the formula for intrinsic standoff ratio work when emitter current is not equal to zero?
Do video on UJT MORE AND BJT DEEP TOPIC usaid in before video is very easy language it is nice about UJT video
Thank you for this video. I hope you also make applied theory to real objects. Appreciate it
Please put videos for gate and technical exams in power electronics.....
Please explain more about INTRINSIC STAND OFF RATIO
P type aluminium rod? Metal semiconductor junction?
i have one doubt sir when temperature increases the resistance should increase but u r saying decreasing , I couldn't understand could you please explain me sir !
For semiconductor material, temperature decreases with increase in resistance and visaversa.
Dude to negative temperature coefficient
CRYSTAL CLEAR EXPLANATION!!
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Sir plz can you upload the , how to do the ujt experiment in labs with clear video
Indian youtubers > university Professors
thank u sir
Sir ujt triggring of scr and ujt are the same topic plz rply
Yes
sir can you show working of UJT. using UJT and not equivalent circuit
I have already explained ujt as relaxTion oscillator
Dear sir , why capacitor is require in ujt triggering circuit
Sir I want videos on AC voltage contollers
Sir good but better to start with symbol.
What difference will it make if we just connect the diode and two resistors instead of ujt?
It will not exhibit negative resistance characteristics
Engineering Funda Oh yes! Thank you so much. Loved your video. It was very helpful
thank you
Sir we use one more battery in emitter to base b1 to increase emitter voltage
sir could you explain why there is a negative current when there is no voltage applied at emitter terminal ?
Sir,I want to know about working of solar cell diode and it's characteristics.Please explain about it.
Sir which book do you prefer for study Power electronics
1. Bhimrao
2. Khanchandani
@@EngineeringFunda Thanks sir
how is it helpful to generate a sawtooth waveform???
You can see my another video on UJT as relaxation oscillator
if current increases, voltage should also increase, then why does it decrease?
That happens due to decrease in resistance
what u said is correct but it is according to ohms law where temperature is constant ... but here temperature will varies therefore ohms law fails here and power equation comes into play.. i.e. p=vi
where power is constant ...so, voltage is inversely proportional to current....
Pls tell wht is unijunction relaxation oscillator
Go through my video based on this topic
Add sweep generator video plz