How Van De Graaff Generators Work
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- เผยแพร่เมื่อ 8 ก.ย. 2024
- Used originally to charge particles in atomic accelerators, Van de Graaff generators now educate students about electrostatics. See how they generate the static electricity that can make your hair stand on end.
nationalmaglab...
This is the only video that's explain the topic correctly, good work guys
The best explanation to van de graaff on TH-cam. Thanks so much
Protons don't move amongst atoms, as shown in your diagram. A positive charge comes exclusively from a lack of electrons. Other than that, great video.
you’re right that the diagrams are a little unclear, but the narration clarifies that the “pluses” are positively charged ions, not protons (for example, at 2:46)
@@jkaptustudios I must've missed that, thanks.
@@sandstorm6689 I don't see how the positive ions would like accumulate on the outside of the sphere from within.. I think its just a matter of stripping the electrons making it more positively charged
@@jkaptustudios That doesn't change anything, it's still wrong. "positive ions" do not move in a metal. Electrons do.
@Rhannmah i don’t remember writing that comment but yes you are absolutely right. thank you for pointing that out. i know that now (and i should have known that a year ago, what was i thinking??)
A good animation of the functional principles of a Van de Graaff Generator.
This video made my brain less panicking about science. Now I totally understand (and can explain myself) how the Van de Graaff generator works. And keep the great animations up!
Mam it is very good to understand thanks madam
Ok suppor to all my subject
The introduction music is like horror movies
Thank you, I actually get it now
waooo 1st time i watched but did't understand but second time i have watched , this is an amazing video to understand van de graff in still 2021...........
3:35 " because the top comb is attached to the metal sphere these positive charges travel toward the sphere and spread out across it they will accumulate on the sphere..." The top comb is attached to the metal sphere by a metal conductor. So this is claiming that metal conduction can be due to ions flowing in the metal? This doesn't make sense. Almost certainly what's being described is that positively-charged air ions move to the top comb, where they are neutralized by electrons there. That draws electrons away from the conductor that's ultimately connected to the sphere, thus causing a deficit of electrons on the sphere. Meanwhile, the now-neutral air molecules simply float away.
I don't know about the second thing, but the ions moving in the metal part? They don't. The top sphere has an overall deficit of electrons, making it positively charged. since positive charges repel each other, the molecules that are positively charged neutralise themselves by accepting electrons from othe molecules. now these molecules are positively charged. this keeps happening until all the charged particles are equally distributed on the outer surface of the sphere.
@Graham_Wideman yeah that part bugged me as well. Thank you for the comment, it seems much more plausible
Where the bottom comb is connected to? Is not explained.
Thank you!! Only video I understood!!!
Thank you so much for the explanation!
What happens if you put the teflon roller on top and aluminum on bottom? Is there a direction of flow in a discharge? Why are the spheres different sizes?
It helped me understand the topic really really well , thank you vmuch
You're welcome! Glad we could help!
Genius invention
Hey all - I am about to rebuild an old Van de Graaff generator that I had cobbled together some years back, and before I do, I have a question about a specific design point that I see in every version of this machine. Is it strictly necessary to have a hole in the top sphere, in which the upper pulley turns? From my naive point of view, I would assume that having the upper comb attached directly to the unbroken lower surface of the sphere would still force the charge to attempt to spread across the entire outer surface of the sphere, and would be more electrically efficient. If someone can point me toward an explanation of why the pulley itself must be interior to the sphere, I would appreciate it.
Yes, it is necessary. Look up the Faraday ice pail effect to understand why.
Hey i am also planning on building a Van de Graaff generator can you instruct me on the process?
wait, the tops positively charged? neat
Really well done explanation that is better than most
Excellent explanation!
Fantastic demonstration of topic good work
Glad you liked it!
I dont understand. How does the protons move on?
I can't undestand one thing. the superior roller became positive, so the belt became negative i think?? And when the negative belt flows down and arrives where there is the inferior roller which is negative...what happened? Both belt and roller are negative so what happen, how the generator start working again, it's very urgent please
Well, I may be a little late, but basically, the bottom roller becomes negative causing the belt to be positive. The positive charge goes up to the top roller, which is more likely to become positive and causes the comb above the top roller to be negative. The positive charge from those combs has to go somewhere, so it goes to the surface of the VDG. Because the top roller is taking the positive charge away from the belt, the belt is neutral in charge once again on the way down to start the process over again.
A very well displayed video.... loved it .... Thank you so much...
Thank's for such a nice explaination
nice explanation!!
Can I use parts of this video for a school project that won't be neither published to the public nor make a profit?
What happens to the negative charges seprated at bottom?
Good work guys
Hi.which software you use for making such 3D animation videos
Very good
The only one I can understand ❤
1:48 wrong, the friction is not the reason for the triboelectric effect. the close proximity of two dissimilar materials is what produces the electricity.
this is very interesting thanks
Great explanation, but I have a question. What happens if there is nothing for it to discharge to? Will the positive charge just dissipate into the air?
Yes, it will dissipate into the air and through the machine, although not much. Over time charge will accumulate on the metal and increase the voltage. As voltage increases, more charge is able to leave the metal through the air and the machine body, but not a lot since those paths are so high resistance. Since the rate of dissipation increases with voltage, but charge accumulation stays the same, there will eventually come a point where the charge accumulation will equal the dissipation and the voltage will remain constant until you touch it with something. If you turn the machine off, charge will very slowly dissipate.
after it reaches a certain voltage, with nothing to discharge to, the air around it will start to break down, ie, ionise, and become a conductive medium. the sphere the discharges with a spark. thats why large particle accelerators that used van de graaff generators kept them in a vacuum chamber (eg the westinghouse atom smasher), as this allowed it to reach a much higher voltage, as it will then have truly noting to discharge to. even discharging through th body does not take place as it is (ideally) insulating.
Increase the sound
Thanks bhai. Bahut good
A Van de graaff generator was based off of a hawksby machine 16 maybe 1700
Vera level 💯 👌 🔥 ♥ 😍 ✨ 💯
So this would not work in a vacuum because it can’t get electrons if there’s no atmosphere to gather them from? Is that a correct statement?
What program did you use to create the 3D graphics?
Thank you for being a Video.....
nice
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thank you❤️🌹
Last scene. End.🙂💟
where did the postive charges go at the end?
The second sphere you see at 3:54 is grounded. The positive charge at the generator accumulates until the voltage difference between the generator and the grounded sphere is strong enough to conduct the positive ions through the air in the room into the grounded sphere - which is seen by the electric arc that forms between them.
Important
you making positive charge moving, but didn't explain what atoms are those?
The atoms that are already there
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Love it 🤠
“As long as the rollers *keep rollin*”
Limp bizkit reference??
i think the music is unnecessary. great vid btw
Nice 😋
Van-duh-graph😂
「どうやってやるの？」、
Watch the process in action here: th-cam.com/users/nlo114videos?view_as=subscriber
NYC
It's easy to make, it's not hard man.
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0.0
Confuse
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Ssshe sssaid..sssmall partssss & combssss, patrssss materialsss, electronsss, rollersss ctrating fricccc tion
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Egg
You explained van de graaff machines so well thanks Danilo B
Boring but helpful lol thanks
I hate physics.
nice