Voltage for grownups
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- Опубликовано: 27 июн 2024
- A description of what voltage really is when we allow for certain circuit parameters to vary with time. This video is about voltage in stationary circuits subject to quasi-static conditions.
00:00 Intro
02:50 Voltage is work per unit charge
07:38 The electromagnetic force
09:18 Motional and non-motional circuits
12:34 The electric force F = q E
12:24 Voltage along finite paths
19:54 Which electric field E?
25:02 Voltage is more than potential difference
27:03 Voltage = PD is a special case
29:05 Conclusion (not really)
My apologies to all native speakers of the English language for the careless butchering of your mother tongue. There are parts of the speech I cannot understand myself. For example, at 07:24 "ballad" stands for "better"; at 10:32 "modesht" stands for "models"; while at 12:39 "thurshaurt" should mean "it turns out".
But let's be frank: who would get past minute five?
(Anyway, I have corrected the subtitles, so...)
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References (the ones that have the same explicit definition of voltage):
Simon Ramo, John R. Whinnery, Theodore VanDuzer
Fields and Waves in Communication Electronics 1e
1965, Wiley
Branko Popovic
Introductory Electromagnetic Engineering
1971, Addison Wesley
Branko Popovic, Zoya Popovic
Introductory Electromagnetics
1999, Addison Wesley
J. A. Brandao Faria
Electromagnetic Foundations of Electrical Engineering
2008, Wiley 
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Amazing explanation sir you're pin pointing what a new learner where get confuse with the abstract concepts
The voltage is very low in the vocal chords of the speaker😂
Can you make a video on energy flow in a circuit??
That is on the back burner. Right now I am planning to upload a video on the IEC definition of voltage, another one on what a voltmeter actually measures, and one on when probing does matter and why. Then I would like to do a video on the role of surface and interface charge in establishing the E field inside a circuit. And only after that consider the energy transfer question (which has a lot to do with surface charge and also requires making some complicated figures).
Great and yeah we need to understand fundamentals correctly. most people do just read the definitions and move on i really like this video
And also I never really understood the term "flux". The magnetic flux and mmf stuff if you can try to put it in your bucket list .
@@lokeshvirat5915 well, there are two important 'dual' quantities that can be defined on a vector field: a line integral that quantifies how much the vectors of the field are going along a given line (when the line is closed this is the circulation), and a surface integral that quantifies how much the vectors of the field go through a given surface (this is flux).
The circulation is associated with the projection of the field along the (local) direction of the path, while the flux is associated with the projection of the field along the direction orthogonal to the (local) surface.
There are very powerful theorems that can relate the circulation of a given field (how much goes around a given closed curve) to the flux of a related field (how much goes through the surface delimited by that closed curve). And if you look at Maxwells equations in their integral form, you will see that they relate fluxes and circulations of E and B. But this is too long a story to be told in a comment.
@@copernicofelinis I'm gonna subscribe and turn on notifications , so I don't miss on this ones
Is it possible for you to improve the subtitles? This topic really interests me but my hearing is so bad.
Is it possible to do this from within RUclips? Do you know?
I have the whole voiceover in the form of text in a web page but I do not have an ad-free website where to upload it to. But a few months ago I had to open a WordPress account to talk to Simplenote's assistance. If I find where I put the credentials, I might upload it there.
PS
Thank you for pretending the problem is in your bad hearing and not in my pronunciation ;-) .
@@copernicofelinisno no my friend, you're good!
I just came home and tried with headphones, it helps a lot, especially with some of the weird mistakes in RUclips automatic captions.
I'm afraid I don't know anything about how to work with RUclips's subtitles but I'm sure that someone will read this and can provide some information.
Again thanks for the video and as my wife will confirm by how I can get startled when she is "suddenly" behind me, giving me a heart attack, my hearing really is that bad 😅
Try now: I edited the subtitles. It should be better, if the changes have been applied.
@@copernicofelinisWhoa, that's a lot better indeed. Thank you so much, I appreciate it dearly.
Like your books
Excellent. I'll keep this in my back pocket for the next time the "Kirchhoff is for the birds" discussion pops off on RUclips. :)
An example of a non-lumpable circuit at ruclips.net/video/vzdFEaVYQXk/видео.html
P.S. @ 22:00 sp "Helmholtz"
I wish I could say it was a one-off typo, but I just realized I have been spelling "Helmholtz" wrong for YEARS. Possibly decades! I just had one of those moments that in the movies are shown with a progressively closer close-up of the actor's face, while the background expands around it.
Thank you so very much for pointing it out.
PS I commented (positively) to your video years ago. 😊
More volume. Can't listen to this
Yeah, I get that a lot. 😭
Out of curiosity, do you think the audio level in my previous video "Dispelling the Lewin KVL paradox" to be acceptable? I was almost shouting, there.
This is probably quite interesting but the voice-over is bad.
Can you re-record it?
Whispering and mumbling is not satisfactory.
I have just finished updating a corrected version of the subtitles. The problem with the voiceover is twofold: first, my abysmal pronunciation (compounded by the fact that the recording was initially meant only to estimate the length of the video); second, the low sensitivity of the mic. I have a Logitech headset that behaved spectacularly years ago in Skype - loud and clear - but as of now with Seven and 10 only produces low levels (something like 1-2 notched over a max of 10) and a lot of noise. I had to record this voiceover with my smartphone, keeping the phone in one hand and a pillow between me and the laptop to muffle the sound of the fans. I also did it in the middle of the night, and my voice was naturally on the whisper side, sorry.
I have an updated version of this video with a couple more figures (not important) and corrections on the name Helmholtz and the formula overlay frame, but I don't think I will re-upload it anytime soon. I will be more careful with the audio levels (and try to improve my pronounciation) in the next videos.
Try using headphones, they can solve the whispering problem. As for the mumbling, I need to work on that 😢.
If the headphones won't do the trick, try the subtitles or better yet the transcript.
I still have a couple of typos to catch, but they should help.
Oh, and thanks for the feedback.
Thanks for the detailed reply, and sorry if I was abrupt but it was frustrating to find such interesting content which I had to abort!
It made sense when you explained that the audio was recorded at night. This was the only problem for me.
If you are able to deliver speech at a daytime volume, any old microphone or smartphone will be adequate.
The only fancy addition might be some post-production compression, but a smartphone probably has that built-in.
Speech doesn't require much bandwidth, dynamic range or s/n ratio. I was unable to follow the content because of the late night whispering :-)
Maybe you need to improve presentation and voice over also
I agree 😊. This voiceover was a recording I did to find out what the length of the video would have been. I thought I could do that in 15 minutes, and it ended up being 33 minutes. Once I cut out all the pauses I had already invested too much time in it to throw it away. I'll try to improve my pronunciation and timing in the next video.
@@copernicofelinis Apart from that, I find your explanations really clear and well backuped with figures and equations. Keep it going!
@@Antonio-lp8hxthanks.