ฝัง
- เผยแพร่เมื่อ 18 พ.ค. 2021
- We all are familiar with microwave ovens. The component inside this machine that’s responsible for producing microwaves is known as a magnetron. When high voltage is applied to the cathode of a magnetron, it ejects many electrons through thermionic emission. When the electron comes towards the anode, it repels the nearest cavity’s electrons. Due to this electron displacement, positive charges form on that surface. The displaced electrons will obviously make a surface of negative charges on the nearby cavity. Now something peculiar happens; the same charge pattern is automatically induced in all the cavities. Do you know how charges induced in just one cavity lead to induction of charges in the other cavities? Let's explore the answer in this video.
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![ทททททททท #27 [หลุยส์ เค โตมายังไง ณ สระบุรี]](http://i.ytimg.com/vi/CaKoYw_Xmtg/mqdefault.jpg)
I really admire the engineers who thought this device up - a true piece of art.
Physicist Albert Hull and Heinrich Greinacher invented this Magnetron
@@lucaarthur8710 sure he did, that's why the magnetron it's all across cathedrals throughout this realm.
Wasn't this channel called learn engineering?
Cause I got confused seeing 'Lesics' in my subscriptions
Edit: They even got so many negative comments for changing the channel name
Learn Engineering was much better
I was about to unsub if I didnt remember the old name
Yes
Yeah why did they change the name 🤔
They explanined it in a video th-cam.com/video/sHC3DihMmgk/w-d-xo.html
They changed their name from learn engineering to lesics...There is a video regarding the name change..in it he explained about the reason of name changing...
@@mrniceguy4277 Im not even offended by this. That was brilliant haha
Almost didn't click to watch because I was so confused by this name change. What happened to Learn Engineering? It was clear and to the point. Just like what is great about the channels content
Thank you...I have learned again today, and at 77 it feels great...Never stop learning people.
Such an awesome video !!! I keep sharing it !! Love your videos REALLY !!!!
Finally some explanation!!!! I was totally giving up on finding the answer to this case.
Excellent video 👍 Thank you 💜
Finally a new vid. And we have no other option but accept the name and get used to it.
But we stil hate the new name. We need two names, similar to Kurzgesagt - In a Nutshell
@@srilemobitelsrile8809 nothing can be done now and it's his channel. Tbh, I don't give that importance what the name should be, I'm just down for the contents, that's enough for me. In the end nobody cares about the name, it's always the contents.
Its a stupid name
Thanks for sharing
Awesome and thanks
Excellent
Awesome. Thanks
Could you follow-up on the actual microwave generation? How/why does the mentioned oscillation occur and how does it result in microwave radiation?
Same doubt
There is a permanent magnet on the magnetron which prevents electrons boiled off of the cathode from traveling straight to the anode, but it's not strong enough to prevent conduction. So you get some cyclotron radiation, but if I understand correctly, it's mostly just to help steer the electrons around the anode, to improve the deposition of charges, which improves efficiency.
Because it takes time to stabilize the charges within the anode (the part shown in the video), electrons from the cathode will continue to conduct to different parts of the anode, meaning the charge will never reach a stable configuration, and you'll continue to get currents traveling around the anode.
The skin effect keeps the majority of this current at the surface of the anode.
The round cavities have currents flowing around them, which makes those cavities act like an inductor.
The geometry of the plates also causes a measure of capacitance, with adjacent plates having different charge, thus having an electric field between them.
The result of this capacitive and inductive geometry is your typical LC oscillator, and it determines the operating frequency (though these circuits are quite noisy because of the inherent randomness of charge deposition). Depending on the different geometry, it could take more or less time for charges to move from one surface to the next, which will determine the frequency of the induced AC current.
As for the radiation:
All moving charges cause EM radiation. They are microwaves because the frequency of the alternating currents induced in the resonator is in the microwave range.
Other geometry in the resonator (the cavities are all connected and also contained in a solid case except for a small aperture) guides the microwaves for output into a waveguide.
He has another video that explains the workings of a magnetron: th-cam.com/video/bUsS5KUMLvw/w-d-xo.html
Yeah why does it create 2.4ghz frequency and not 30hz for exemple?
What if there are odd number of Tentacles(METAL BLOCKS)??
Lesics got me confused... :)
Same here
If you type Learn Engineering, you will come to this channel anyway. And the logo is same, so I don't see the problem.
The contents still rocks.
We should all accept the new name and get used to it. And the comers will know this as lesics, unlike us haha.
@@chess1011 no one has problems with the name, it's the channel's popularity that will suffer due to this bizzarre name
@@chess1011 bro it's just my notification which made me think "when did I subscribe to this channel"
@@rajveersingh2056 ngl😅, that would have also confused me if I hadn't watched the "I will change Learn Engineering to Lesics'' video.
Great animation
Your every video makes me believe in fundamental Physics more and more
Boy if we ever run out of electrons ? I don’t want to be here than
A very good explanation the best I have seen
👍🇧🇷🙏🏼
Por favor, faz um vídeo sobre o circuito Ladrão de Joules.
Awesome 👍😎
I love these videos
Outstanding video!
Very good
Very very very very very very very very cool animation🤗
i think i understand, but it would have been good to explicitly explain why the blue fields lines are now curved at 3:00. Presumably it's because the faces of the teeth/splines are now no longer parallel. Does this mean that the linear case would also establish a pattern of charges if the teeth were closer at their tips?
I am very confused about the arrows on the last schematic with the electric fields, the arrows goes once from + to - and, on the next one from - to +.
I don't really understand that
Nice brother
Rockin’ it
An older version of microwave machine was made by triangles with bridges (connections) between each 2 bars and electric current passing trought the bars in AC mode. How it changed?
watching this right after Tom Scott’s video, it’s a win your honor
This video's make me happy 😁
गजब भाई ।
That's great
Nice brother 🤠🤠
Finally ❤️
does the antenna output also generate radio frequency or high frequency alternating current?
What would happen, if the number of finns in the circular shape would be uneven instead of even? Then such an arrangement of charges couldn't happen
I like how some people refer it as "Black Magic" instead of "Alien Technology"
What happens if there are an odd number of bars in the cylinder ? They couldn’t go positive negative the whole way round then
Great work!
great comment
Please Make a video on air defence system 🙏
if there is an electric charge within the magnetron ,is there a way to chanel that electricity from a big magnetron to electrifie tools,machine ?
I don't understand in this video
But i like this channel
Can you guys do a video on LASERS please. I've been trying to find a good explainer video about LASERS all over TH-cam. I've yet to find one ! 🙂
Honestly this gives me more questions than it answers, I don't think anybody knows whats happening inside
May I know the app that you use to make the animation
Can someone explain how this beautiful animation is done and which software is used
Done in blender
I think an orthographic (instead of perspective) camera could really improve some of your shots. Much easier to see whats going on (when not transitioning between angles).
So well explained....thank you
Domino effect, genius idea
Does this spin around the beryllium cathode?
This is excellent. Thanks for sharing this.
Perhaps you could make a video explaining how radar works. How a signal is generated, and how that signal is returned and detected.
Thanks again!
☀️😎🇺🇸☀️
0:18 I think you mixed up cathode with anode, when I google it it says "a cathode is referred to as the positive electrode because it gains electrons"
Dude I thought this was about Megatron 🤖
It is weird how different youtube channels seems to be in-line with each other when they are covering similar topics.
Tom Scott covered a microwave story just last week.
This is very interesting. I wonder how it works everytimes. And now i know 😄👍
best explanation for a cavity magnetron is at Learn Engineering. This thing was so complex that scientists didn't know how it worked until one day they cracked the code. It's so simple yet so complex.
i need the simulation of the magnetron please
Wow....now I know
Why didn’t you say it is a Soundwave like reaction that happens when closing the circle. As the wave microwave soundwave bounces around the inside of the circle. It starts to create energy field more less now put a inner ring and a sitting area with magnets and mercury rot around that in opposite direction of circles rotation
If I didn't know any better I'd say this was "Learn Engineering" self identifying as some other unintelligible name.
It's not a misspelled laser surgery?
Nice explaination
The video made no mention of the magnetic field that curves the path of the electrons, or the time delays associated with operating at microwave frequencies. Or how the charge oscillates from one side of each cavity to the other. As an explanation of the operation of the magnetron it really does not go far enough.
@@mikehodgetts4864 the error was in failing to distinguish between high frequency a.c. behaviour and that of dc. Clearly in a lump of metal like the anode, surface voltage differences cannot be maintained except at microwave frequencies. The magnetic fields across the cavity resonates openings are the result of the RF current flowing round each cavity.
oh good
very well explained！
Microwave? Nah, give me a linear accelerator for radiotherapy
🔥🔥🔥🔥🔥🔥
never defined what an electric field is. asked Gemini AI, and its explanation was indirect, and obscure. what i gather, is that, an electric field can be positive or negative. it is a bubble force-field, under Hooke's law. why not say so? - being direct is so much more efficient. do we even know what an electric field is, in a quantum sense? - because, if not, saying so, would be important too.
But what happens if the number of cavities in the ring is an odd integer?
Then you do not operate in PI mode. It works but not as stable as the PI mode. Search for "magnetron strapping" how you connect the various cavities to stabilize the frequencies.
You can have rugs beautiful technology for a small sum of $50 at your local Walmart, after a year you’ll have to buy another one. My second one just broke last week.
Ok, so now how can I make a homemade RADAR with that?
Please make more videos on Microwave Devices and Microwave Engineering ...btw awesome vdo
0:38
Ah but yes, obviously it does! /s
If this had been my physics teacher; i would've failed physics for sure.
Why you changed the channel name ?
th-cam.com/video/HFky632EAjM/w-d-xo.html
TL;DW. He made this channel for fun, with little thought regarding channel name. This decision haunted him for years. So he decided to finally change channel name,
Besides microwave, what can a Magnetron be used on other purpose?
The copper heats up because of its resistance so you can generate heat.
Just joking - a microwave device is good to generate microwaves.
How is possible? The same metallic conductor not have separate surfaces for accumulate different charge. Your rappresentation is wrong.
Lol the robotic voice over for the "Emworks" .
What happens if you add or remove one cavity?
You will change the frequency (btw remove even numbers to keep it stable - Pi or pi/2 or pi/4 etc modes are stable, so the number f fins N should be even) Visualize it like you can flatten the circuit by cutting it, then unroll into a linear shape (like when you flatten a cut ring) and draw a sine wave on top of it, eg fin1 0, fin2 1, fin3 0, fin4 --1, fin5 0 etc. If you can end the sine wave in the same position as it started, like fin1=fin5 then you can see that with eg 4 fins you can have a nice stable periodic field.
Uuummmm yep gotcha that's how the Towers turned into dust!!!!!!!
Okay I thought I was confused because I was high now I realize it's just gibberish and is probably totally incorrect.
Now answer why the hell someone would cook a chicken in the microwave.
you should have explained this to the American military scientists in WWII who couldn’t figure out how these things worked 😂😂😂
Can make it work take power from air
Give this tutorial an extra two mi utes and itll be aalmost perfect.
They stopped right before the finale'.
Lot happening invisibly
great sir ji 🙏🙏🙏🙏
Part 2??
*Microwave’s Oven Magnetron Surface Charges*
4:15 Chick spinning in red light...
Um, what about the magnets?
I hope see my comment
If you see...
Please , make a video about rotary vane engine
Hello
Lesics is good
So yeah my cousin still thinks that microwave has a heating bulb
I tried to shows these
And
Still didnt believe me
Want more turkey based physics
Optimus Prime disagrees.
Sir videos make in urdu. English as will as hendi.
Induction
Requeste. Chage the name to learn engineering
first.