I'm an international student in India at a college where the medium of instruction is Gujarati and every time I try to check lectures on TH-cam it turns out to be Indian guys lecturing in Hindi. This channel is now my second option.
Dear Prof. Chasnov, thank you for the whole "for engineers" series! ! Very much helpful for my self-learning! Question: though said you won't do how to define Q, can you give a reference of how? is there a method or simply by guess and try?
I just watched your nondimensionalization th-cam.com/video/SMs-40stA10/w-d-xo.html, am thinking you define Q by cancelling out the units. But I am so confused by the unit of L and q now...😂
Pretty sure this is usually done by mirroring the video, he writes normally to him on a clear piece of plastic with a camera behind it, then they flip the image to make the writing look correct to us.
Dear Pro.chasnov understood the circuit in short form of vr vl vc but I still didn't understand the full form of vl pls reply😕 Thank you by vivaan shah....
Isn't the voltage supposed to be Vl=-Ldi/dt ??....where people Mix up Kirchoff laws with Faraday's , the total emf should be -Ldi/dt then crossing over makes it positive so it looks like KVL equations when its not ..... Vl=-LdI/dt ,Vr=IR,Vc=Q/C.. Adding according to faradays law :IR + Q/C + 0 =- L(d^2Q/dt^2) Then taking all the terms to the right side makes the induced voltage positive and they all equate to zero ....so KVL is wrong to be used in this analysis as there's no Potential across an ideal inductor because there is no electric field
no. Vc is the voltage across the capacitor so it has nothing to do with L. VL in respect is the inductor so similarly has nothing to do with the capacitor. Resistor is the same. but resistors are much easier. V=IR. for the Voltage across any one of these elements its as simple as voltage division. in mathematical terms u need to change the Ferats and Henry into ohms to achieve this. but other than that V.Div will achieve Vc. Vl, Vr.
Thanks a lot for the explanation sir, been a big help. Also, on a side note, you do kinda remind me of Mike Ehrmantraut from Breaking Bad xD. No offense sir, only compliments :)
Yeah but in reality we never solve a constant coefficient differential equation we just represent it as phasors (basically Laplace transform) and solve it like algebra
Phasors only works with sinusoidal source. Differential equation is more powerful it can deal any type of source. So its a good idea to practice solving this way.
Prof. Chasnov I have a question. What if the circuit elements or components are in parallel instead of series configuration? What would the differential equation look like?
@@Coolgiy67 yes you can, seems a little overkill but I have done that. I have a MS in Control Systems where I use Linear Algebra techniques. Use them in nonlinear applications as well....
@@ProfJeffreyChasnov Yeah well in situations involving time varying magnetic fields kirchhoff's law doesn't hold anymore as the closed loop integral of the electric field is no more zero. Rather it is -L(di/dt) by Faraday's law. Both leads to the same result equation-wise but using kirchhoff's law is wrong.
Find other Differential Equations videos in my playlist th-cam.com/play/PLkZjai-2JcxlvaV9EUgtHj1KV7THMPw1w.html
First non-indian eee channel. thank god.
coffee コーヒー it’s all about that accent
☠️
I'm an international student in India at a college where the medium of instruction is Gujarati and every time I try to check lectures on TH-cam it turns out to be Indian guys lecturing in Hindi. This channel is now my second option.
💀
bestest explanaition amongst the bestest. weldone proffessor
bestest
Dear Prof. Chasnov, thank you for the whole "for engineers" series! ! Very much helpful for my self-learning! Question: though said you won't do how to define Q, can you give a reference of how? is there a method or simply by guess and try?
I watched the one about reference values and scalling factors, but this doesn't seem like the method you used to define Q, right?
I just watched your nondimensionalization th-cam.com/video/SMs-40stA10/w-d-xo.html, am thinking you define Q by cancelling out the units. But I am so confused by the unit of L and q now...😂
@@yugao2410 Look at my notes "Differential equations for engineers"
@@ProfJeffreyChasnov very well got, thanks!
This is what i was searching
thank you for the clear explanation! :)
Great vid!! But were you writing backwards? 🤔
Explanations are good.
Why do we have to make non dimensional parameters
6:20
Sir Why did you assume E⁰ to be coswt and not sinwt
could you please tell me how you write in the screen ?
Pretty sure this is usually done by mirroring the video, he writes normally to him on a clear piece of plastic with a camera behind it, then they flip the image to make the writing look correct to us.
@@sam.b7949 have you ever tried it ??
Dear Pro.chasnov understood the circuit in short form of vr vl vc but I still didn't understand the full form of vl pls reply😕
Thank you by vivaan shah....
Vc,vl and vr means that voltage across the inductor whose short form is vl similarly for others
take a bow sir... thanks a lot
Isn't the voltage supposed to be Vl=-Ldi/dt ??....where people Mix up Kirchoff laws with Faraday's , the total emf should be -Ldi/dt then crossing over makes it positive so it looks like KVL equations when its not .....
Vl=-LdI/dt ,Vr=IR,Vc=Q/C..
Adding according to faradays law :IR + Q/C + 0 =- L(d^2Q/dt^2)
Then taking all the terms to the right side makes the induced voltage positive and they all equate to zero ....so KVL is wrong to be used in this analysis as there's no Potential across an ideal inductor because there is no electric field
Sorry, I'm not an electrical engineer. I pulled the equation from my old physics textbook.
no. Vc is the voltage across the capacitor so it has nothing to do with L. VL in respect is the inductor so similarly has nothing to do with the capacitor. Resistor is the same. but resistors are much easier. V=IR. for the Voltage across any one of these elements its as simple as voltage division. in mathematical terms u need to change the Ferats and Henry into ohms to achieve this. but other than that V.Div will achieve Vc. Vl, Vr.
R is also technically really Z for impedance. AC current is impedance where as DC is resistance. not huge deal just a quick little quip of info.
Can you tell me is that a higher order linear df eq
very helfull sir thanks
Very good 🙏🙏🙏🙏
I can't download the notes.
Could you say something when cosωt < 0? Could Lq'' + Rq' + q/C = -εcosωt ? THANKS!
cos isolates between negative one and one.
Thanks a lot for the explanation sir, been a big help.
Also, on a side note, you do kinda remind me of Mike Ehrmantraut from Breaking Bad xD. No offense sir, only compliments :)
How does this math apply to a real world scenario? What would this be used for?
Filters
How you make nondimensional charge Q
You can scale it out.
is he writing backwards on his side of the board?
No. Mirrored in software.
@@ProfJeffreyChasnov what application Sir used? would like to use it too. good way to do teaching live online
Question: Why did you move to Hong Kong? Curious!
Moved in 1993. My wife is from HK, and I liked the job offer.
@@ProfJeffreyChasnov wow, interesting that's a huge change moving from the US! I'm pursuing my engineering degree, but I love math as well!
great explanation but eeeehhh. the squeaking of the marker
Yeah but in reality we never solve a constant coefficient differential equation we just represent it as phasors (basically Laplace transform) and solve it like algebra
Phasors only works with sinusoidal source. Differential equation is more powerful it can deal any type of source. So its a good idea to practice solving this way.
Prof. Chasnov I have a question. What if the circuit elements or components are in parallel instead of series configuration? What would the differential equation look like?
You’ll have a system of differential equations
@@Coolgiy67 and use Laplace transform...
@@jstone1211 you could use linear algebra as well. You can use eigen vectors to solve the system of diff eqs
@@Coolgiy67 yes you can, seems a little overkill but I have done that. I have a MS in Control Systems where I use Linear Algebra techniques. Use them in nonlinear applications as well....
@@jstone1211 nice I work as a hardware engineer only have a bachelors in EE I’m thinking about doing a masters cause I’d like to do analog ic design
Make sure prof. Walter Lewin never watches this video, he's gonna be pissed about Kirchhoff's Law being used :)
Why?
@@ProfJeffreyChasnov Yeah well in situations involving time varying magnetic fields kirchhoff's law doesn't hold anymore as the closed loop integral of the electric field is no more zero. Rather it is -L(di/dt) by Faraday's law. Both leads to the same result equation-wise but using kirchhoff's law is wrong.
The video sound is forward and video is back
Thank you. TH-cam seems to be messing up my videos. I will try to fix it.
If anxiety was a teacher it would be him xD
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Jokes aside, great video! Thank you.
Dude, love your whit. But this man gets and A for his effort. He's a typical "teckie" type.
I don't understand your concept
hollup, you write backwards?😶😐😮