|
https://www.youtube.com/watch?v=4BlpONgj74A
|
#
?
Oct 29, 2019 19:06
|
|
|
|
| # ? May 29, 2024 08:57 |
|
|
i've been rather ignorant to how different displays work, but i watched this last night and blew my mind. the explanations seem pretty legit https://www.youtube.com/watch?v=v4WFOmBzHVg i knew crt's have an "electron gun", but i didn't know the directionality of the elections itself were controlled with electromagnets. makes sense, and the most accurate way of doing it, without any moving parts how LCD monitors work are really interesting too. it's all amazing engineering no one really seems to think about, even though it's part of just about everyone's lives, every day Good Sphere fucked around with this message at 18:59 on Oct 30, 2019 |
|
#
?
Oct 30, 2019 18:19
|
|
|
yeah, you wouldn't believe how small the levers need to be to direct the electrons mechanically
|
|
#
?
Oct 31, 2019 03:22
|
|
|
3 phase electricity from power plants https://www.youtube.com/watch?v=4oRT7PoXSS0
|
|
#
?
Oct 31, 2019 16:07
|
|
|
Good Sphere posted:3 phase electricity from power plants Oh God this brings me back to Circuits 2 class in school. I recall being good at solving those problems, but never understood wtf I was doing.
|
|
#
?
Oct 31, 2019 19:38
|
|
|
Janitor Prime posted:Oh God this brings me back to Circuits 2 class in school. I recall being good at solving those problems, but never understood wtf I was doing. up until now, i had no idea that electricity from plants output in 3 phases, and that homes typically use one, or that power plants were designed that way. i still don't even understand the fundamentals of how electricity is created, stored or transferred. i know how it can happen with magnets, but i still don't know on the atomic level. every video i find about it seems to be about power plants turning turbines with hot water, and that's it
|
|
#
?
Oct 31, 2019 20:49
|
|
|
lol watch this video it literally covers how the magnet rotating generates electricity
|
|
#
?
Oct 31, 2019 21:45
|
|
|
Janitor Prime posted:lol watch this video it literally covers how the magnet rotating generates electricity so i guess just because electrons are moving back and forth that is electricity? could I build something on a smaller scale by having loop of copy wire with the coils and a spinning magnet to generate electrical current? how does it relate to light or other electric magnetic waves, and how does it separate with magnets and electricity?
|
|
#
?
Oct 31, 2019 23:10
|
|
|
Good Sphere posted:so i guess just because electrons are moving back and forth that is electricity? could I build something on a smaller scale by having loop of copy wire with the coils and a spinning magnet to generate electrical current? might i recommend enrolling in physics ii: electricity and magnetism at your local community college, op?
|
|
#
?
Oct 31, 2019 23:17
|
|
|
Just get a used copy of Understanding Physics by Isaac Asimov it will be 10x more interesting and 100x more complete than anything the forums will produce.
|
|
#
?
Nov 1, 2019 00:01
|
|
|
Salt Fish posted:Just get a used copy of Understanding Physics by Isaac Asimov it will be 10x more interesting and 100x more complete than anything the forums will produce. thanks i’ll look into that
|
|
#
?
Nov 1, 2019 03:11
|
|
|
Good Sphere posted:could I build something on a smaller scale by having loop of copy wire with the coils and a spinning magnet to generate electrical current? Did you not literally do this exact experiment in like 4th or 5th grade Science?
|
|
#
?
Nov 1, 2019 18:46
|
|
|
Good Sphere posted:how does it relate to light or other electric magnetic waves, and how does it separate with magnets and electricity? a changing magnetic field in a coil of a conductor will generate electricity. a coil carrying current will generate a magnetic field in the loop they are directly related
|
|
#
?
Nov 1, 2019 19:00
|
|
|
Schadenboner posted:Did you not literally do this exact experiment in like 4th or 5th grade Science? i wish. we played around with magnets, but not why it actually happens fundamentally CRIP EATIN BREAD posted:a changing magnetic field in a coil of a conductor will generate electricity. that's cool. up until now, i didn't give it much thought; as if lightning was somehow pushed through a wire into your house
|
|
#
?
Nov 1, 2019 19:10
|
|
|
to get my CS degree my school made me take both mechanical and electromagnetic physics courses. glad i did. in the end, you're probably going to be surprised that stuff like hydro, coal, and nuclear power all generate it the same way. hydro takes the movement of water to rotate a turbine, coal and nuclear both just generate steam to rotate a turbine. there's nothing magical about it, really. it's all very physical, actually.
|
|
#
?
Nov 1, 2019 19:14
|
|
|
good sphere is about one week away from inventing a perpetual motion device
|
|
#
?
Nov 1, 2019 19:35
|
|
|
I really “like” electromagnetism.. like.. really like it
|
|
#
?
Nov 1, 2019 19:40
|
|
|
Sagebrush posted:good sphere is about one week away from inventing a perpetual motion device  
|
|
#
?
Nov 1, 2019 19:55
|
|
|
CRIP EATIN BREAD posted:to get my CS degree my school made me take both mechanical and electromagnetic physics courses. i have a very useless audio production associates degree. the closest i got was a class to build a preamp, and an acoustics course. the acoustics course was probably the most technical, in depth class with all the physics behind sound. since then, i haven't used it, so i forgot basically all of it i didn't get into programming until someone taught me web and backend stuff 12+ years ago when i was out of work. i taught myself a lot of math along the way when experimenting with different languages, which i had no idea that i'd ever be fascinated with it (math or coding). lately i've been catching up on all the science-y stuff CRIP EATIN BREAD posted:in the end, you're probably going to be surprised that stuff like hydro, coal, and nuclear power all generate it the same way. hydro takes the movement of water to rotate a turbine, coal and nuclear both just generate steam to rotate a turbine. there's nothing magical about it, really. yeah that's interesting. i knew for a while now that almost all of them use heated or flowing water to turn a turbine, but not exactly how that generates electricity
|
|
#
?
Nov 1, 2019 20:00
|
|
|
i love the kind of stuff good sphere is talking about. like I super love physics on a pop culture level. as opposed to gaining insight through tireless mathematics, I prefer to read a great analogy spoken by a person with a galaxy brain vocabulary brian greene’s books are some of the most awe inspiring and interesting things i’ve ever read. I think one of them was made into a show but I doubt the show covers the same amount of ground but his books really do delve into the physics in a way I think good sphere would really appreciate. it was a pure fluke that a woman physics student who was just a customer in the pharmacy who i was flirting with recommended them to me, they’re probably the most interesting books I’ve ever read
|
|
#
?
Nov 1, 2019 20:32
|
|
|
CRIP EATIN BREAD posted:to get my CS degree my school made me take both mechanical and electromagnetic physics courses. lol my bs cs (top 10) didn't even make me take the additional math courses that would have been prerequisites for those physics courses i haven't been in a physics class since high school
|
|
#
?
Nov 1, 2019 21:04
|
|
|
Good Sphere posted:i wish. we played around with magnets, but not why it actually happens fundamentally did they explain how the gently caress they work?
|
|
#
?
Nov 3, 2019 20:56
|
|
|
we know how to generate electricity, we know how to consume it, how to regulate and control it but we still don't know what it is
|
|
#
?
Nov 3, 2019 20:56
|
|
|
It's the friends we made along the way, Jonny
|
|
#
?
Nov 3, 2019 21:35
|
|
|
Jonny 290 posted:we know how to generate electricity, we know how to consume it, how to regulate and control it according to rabbinical law it's fire. what more do you need to know? (shrugs in yiddish)
|
|
#
?
Nov 3, 2019 21:35
|
|
|
what is energy? we just don't know
|
|
#
?
Nov 3, 2019 21:58
|
|
|
Jonny 290 posted:we know how to generate electricity, we know how to consume it, how to regulate and control it don’t we? I was pretty sure we knew it was basically the electromagnetic field attempting to even out.. like what does it mean to say we don’t know what it is? it’s a label for an interaction of one of the fundamental forces 🤔 what am I missing? I guess you could argue that despite understanding it in depth on a number of levels, that doesn’t mean we know what it is.. but then the same could be said about anything in the field of fundamental physics right??
|
|
#
?
Nov 4, 2019 00:14
|
|
|
We know what it is, it's electrons moving between atoms.
|
|
#
?
Nov 4, 2019 00:27
|
|
|
echinopsis posted:don’t we? I was pretty sure we knew it was basically the electromagnetic field attempting to even out.. https://www.youtube.com/watch?v=36GT2zI8lVA
|
|
#
?
Nov 4, 2019 05:28
|
|
|
echinopsis posted:don’t we? I was pretty sure we knew it was basically the electromagnetic field attempting to even out.. Right but all we know is that when you pass a magnetic field over a conductor, it triggers electron migration. we don't know why. it's an electron, it shouldn't give a gently caress about a magnetic field hell, for 100+ years we have had electrical polarity backwards. the negative terminal/ground of your car is actually the supply of electrons. positive voltage is defined by 'holes' that are thirsty for electrons. Every single wire you've ever hooked up with a positive voltage is actually a miniature electron vacuum cleaner.
|
|
#
?
Nov 4, 2019 05:37
|
|
|
neg my poz hole
|
|
#
?
Nov 4, 2019 05:40
|
|
|
Jonny 290 posted:Right but all we know is that when you pass a magnetic field over a conductor, it triggers electron migration. we don't know why. it's an electron, it shouldn't give a gently caress about a magnetic field so why don’t know “why” electric fields and magnetic fields are fundamentally linked.. I mean I follow you but it’s a bit like going down a rabbit hole of particle physics and saying we don’t know “why” things act as they do.. I don’t think it’s possible to answer.. 🤷♂️
|
|
#
?
Nov 4, 2019 05:48
|
|
|
i'm not saying that it's knowable, just that it's unknown we're on the same page
|
|
#
?
Nov 4, 2019 05:49
|
|
|
Jonny 290 posted:Right but all we know is that when you pass a magnetic field over a conductor, it triggers electron migration. we don't know why. it's an electron, it shouldn't give a gently caress about a magnetic field isnt magnetism just what you get when you add special relativity to electricity? https://en.wikipedia.org/wiki/Relativistic_electromagnetism quote:An observer at rest with respect to a system of static, free charges will see no magnetic field. However, a moving observer looking at the same set of charges does perceive a current, and thus a magnetic field. That is, the magnetic field is simply the electric field, as seen in a moving coordinate system.
|
|
#
?
Nov 4, 2019 14:27
|
|
|
walking towards the outlet which I can sense its current given my movement, but I stop to plug in: what the gently caress, where’d the magnetic field go??
|
|
#
?
Nov 4, 2019 15:00
|
|
|
i saw something else weird; an experiment with an electron gun. the electrons were shot on both sides of a pole with an electromagnet that wasn't turned on, which still made a different fringe pattern if the pole wasn't there at all. even though the electromagnet that was turned off still had a very subtle electric field, it wouldn't have affected the fringe pattern that much. so they found out that a field still exists that could potentially still be there? i dunno i don't really get it, but it's still cool edit: this is the video in question. just a fair warning, this guy will probably be considered to most as annoying af, and videos for children, but to me he covers a lot of fascinating topics and it pretty thorough without all the math and complexities. he also does really weird gestures with his hands. he's like a humanized cartoon. also i haven't been able to watch it again as a refresher, and my explanation was probably very lovely and/or wrong https://www.youtube.com/watch?v=a70Bmkza7XA echinopsis posted:i love the kind of stuff good sphere is talking about. okay so more asimov and brain greene; thanks. i heard of the book "Elegant Universe", but the title is considered misleading or something? Vomik posted:did they explain how the gently caress they work? haha no Good Sphere fucked around with this message at 18:14 on Nov 4, 2019 |
|
#
?
Nov 4, 2019 18:04
|
|
|
Good Sphere posted:okay so more asimov and brain greene; thanks. i heard of the book "Elegant Universe", but the title is considered misleading or something? idk about the title being misleading but.. welp the other book I found super interesting was a feynmann one where he’s discussing using this clock metaphor system how to add up potentials of photons over different potential paths to find out what which paths a photo would take are more likely and for standard situations it’s as you predict but why making diffraction grates can make all sorts of unusual effects and seem to make photons bounce through what would classically be considered impossible paths it wasn’t his lectures it was a book he wrote
|
|
#
?
Nov 4, 2019 19:30
|
|
|
if you want to get back on the physics train ]these books were recommended in the pseudoscience thread. i'm working through the problem sets pretty slowly but everything is understandable up to the final few chapters. it's amazing how many years of physics classes you can condense if you assume your audience knows calculus already. I can tell immediately where my calculus experience drops off at pdes too. you can probably just do the online coursework style ones too ymmv
|
|
#
?
Nov 4, 2019 23:36
|
|
|
i've been watching this series of 1950s lectures on aerodynamics called "the secret of flight." it's really cool stuff. everything is done with physical models and smoke tunnels and it's immediately clear what is going on. the lecturer is a weird old german guy but he's very good at explaining what's happening. i think for the first time i genuinely understand how lift is formed -- not just the high school "air travels faster on the upper surface" but also why the air goes faster and all the phenomena that that entails. https://www.youtube.com/watch?v=V1oCDR3DBbo  favorite bit so far: a brief film is shown depicting an experimental nazi rocket plane taking off and the host says "now this is the 163A, which i designed in 1938" because he is https://en.wikipedia.org/wiki/Alexander_Lippisch 
Sagebrush fucked around with this message at 06:01 on Nov 6, 2019 |
|
#
?
Nov 6, 2019 05:41
|
|
|
|
| # ? May 29, 2024 08:57 |
|
|
Jonny 290 posted:Right but all we know is that when you pass a magnetic field over a conductor, it triggers electron migration. we don't know why. it's an electron, it shouldn't give a gently caress about a magnetic field this hosed my head up when I first learned it. it’s also my excuse for struggling with understanding transistors and having to check what VCC, VDD etc are whenever I encounter them.
|
|
#
?
Nov 7, 2019 14:10
|
|
