Electric Current: Crash Course Physics #28
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- čas přidán 1. 06. 2024
- So, electric current works like a river... kinda... Instead of flowing based on elevation, electric current works a little differently. But it's a good metaphor. In this episode of Crash Course Physics, Shini talks to us about electric current, voltaic cells, and how we get electric charge.
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Produced in collaboration with PBS Digital Studios: / pbsdigitalstudios
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We made quiz questions to help you review the content in this episode! Find them on the free Crash Course App!
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she has a lot of potential to be a rapper
Very well done, bravo. Still have no idea how electricity works though, but that's just because I'm not very.. bright.
Victor Cahat to better understand it you'll have to learn how atoms work.
to put it short, electricity flows through electrons.
Victor Cahat I see what you did there ...
Same, I know the feels.
Victor Cahat get out
Victor Cahat I’m learning this and how to code in sixth grade. My midterm is today and I’m studying this morning. I’m learning stuff not even many 40 year olds know.
These "fast" videos are perfect for reviewing and getting everything neat and simple in ma brain after the lesson.
FluffyRawan nice what’s
Stop spilling hate the name is 'CRASH COURSE' for a reason. It is fast on purpose
Wow
Instagram : H3XA Crash course is not for learning but revision you dingus. This way you can revise a terms worth of study in less than ten minutes. Stop hating on these well produced videos. I bet you didn’t even take the time to rewind and LISTEN to what they were saying 😒
hey all,
just something to consider if you feel like she's talking too fast,
it's actually the editing. the editor is cutting the start of each new vocal passage per scene so that it cuts in right after the presenter stops talking.
so there are very few breathing bits.
it's a way of maintaining consistent audience attention by subtly changing dynamics, but it does also kind of irritate people who prefer a normal human conversational pace.
Nice
noice
👍😁😁😂😂
Niceee
SP Plays I normally watch educational stuff on 2x speed anyways so I didn’t even notice.
While water pressure and flow are a handy way to mentally model electrical voltage and current, it is worth noting that electrons themselves move very slowly (only millimeters per second) through a conductor in the direction opposite the current ("electron drift speed"), while electrical current moves close to the speed of light. The way to picture this is, that the electrical conductor is a tube, packed full of balls from one end to the other. When you push a ball (electron) in one end of the tube, it almost instantly forces a ball out the other end of the tube. The speed at which that pressure information is transmitted from one end of the tube to the other is the speed of electrical current, while the speed at which the balls move through the tube is electron drift speed.
daemn42 thank you! I imagine it as them bumping into each other or like water in a pipe. When you turn the faucet, the water coming out doesn't come directly from the source but only pushing out a very small fraction of water from the back all the way to the end of you faucet.
Very interesting. Thanks.
the drift velocity of electrons is proportional to the electric field and with electric fields of the order of 10^4 V/cm, the drift velocity of electrons is well beyond mm/sec. electrons move only a few mm/sec is a misconception, they can move a lot faster as well.
@@whatever3041 But they still move glacially slow compared to the electrical current, which is very close to c, right?
@@whatever3041 this doesn't apply for electron moving through a conductor right
I think that crash course music theory would be a good topic.
i agree
Wow her explanation is just so good! No one can ever explain things like her and with such passion and enthusiasm.
Simply loved it
This was a _shocking_ episode!
At the current state, it has potential to be the most shocking of all episodes.
The power was too strong to resist for me.
You need to improve your capacity to avoid puns.
Watt are you guys on about?
OHM-mygosh. If we don't all stop soon, we'll get PUN-ished.
Watt the heck? Never expected such current and up-to-date info. This video is like a joule because it’s so great.
turn down for watt 😂😂
no
@@RPGraid yes
I like that song
Nice
Your nice
You guys could really do a Crash Course series on electricity. Watching my friend build his digital pinball machine with solenoids, circuit boards, and switches, I realized how little I know how to apply what's taught in a high school (or even college) physics class.
I love learning about electricity! It's been a while since I studied it back in college. I had total forgotten about the coulomb! Ohm's law, however, is as fresh as when I learned it for the first time. Keep em coming CrashCourse!
Man, so much work goes into making this.. thank you!
wow this went way over my head lol
Guys make the speed 0.75, there's a button you know
tnx, very helpful for non native english speakers like me!!!
"Turn down for Watt?" 😂
Always copying
Me reading all the comments saying she talking too fast listening on 1.25 speed 👂👁👄👁👂
I love this video, very descriptive!
covered a lot of the ambiguity I had to deal with, while I was scratching my head trying to learn this stuff!!!
Bravo! Good job!!!
I always love the stuff Crashcourse does; your teams seem very professional and funny.
I do wish that you had gone into the relationship between amperage and current a bit more though🙁
These videos are so good. Thank you so much Crash Course & PBS!!
this video plays in my head during my exams :D
thanks CrashCourse!!
i loved it and this is really great to learn....i am so happy. thank u so much crashcourse
I like her accent
It's just a standard middle-class English accent.
1:54
Uh what? That circuit would operate fine without that grounding wire. It doesn't need 'earth' to supply electrons. 'Grounding' simply provides reference to the system, in the case of earthing, the reference being earth.
Finally an explanation with good animation and narration !
This is a great video. It's really helpful.
That was great! It was informative and a lot of fun.
I always use crash course to study and review the video about 5 times to miss anything I didn’t get as my study guide before a test, I ace the test every time too, it simplifies everything down for me.
either I'm really dumb, or she's going really fast
you were right, i didnt catch a few words when she's speaking
nah, she is going way too fast...
She is going quite fast I can't keep up with what she's saying. this video didn't really help me...
I tried playing at .75 speed, she sounded drunk as hell.
all you need to know really is that v=ir with i being current and r being resistance
Wow! I learned in 8 and a half minutes what took me about an hour to learn!!! These are quite good videos!!!
Thank you! This video was very useful to me 😀
thank you for the video....I had to watch more than 3 times.....there is lots of useful information in 8 minutes
I= 1C/1s = 1Amp
V=IR
P=energy/time= change in charge X voltage/time
P= IV = I^2R = V^2/R
Thanks so much this video just taught me everything we did this term
I like this host's enthusiasm.
who ever invents a room temp super conductor is gonna be rolling in money
tommy tran probably not. The patent will be owned by the uni or company they are conducting the research on behalf of
tommy tran I
@@xiLoveYouix unless they're the founder of their own electricity company
Great video! Keep up the content!
You guys are the best!
i bloody love this series, I hope it's 100 episodes long as there's so much to talk about. Or follow it up with Crash Course Maths or Crash Course Engineering
thx for this awesomely ha bisky short video i loved listening to it i find out i get just as much out of these as listening as i do watching them so i multitask
Thank you :D very nice work
SHE CONFUSED ME EVEN MORE, THIS ELECTRICITY THING DOES NOT ENTER MY MIND. SO COMBLICATED
Great work...
Awesome video
Positive charge current flowing oppositely its negative electron charge current, is less confusing to advanced students when they recognize that electron charge movement displaces the local field positively in the opposite direction-like boats displace water; _a wire moving against its electron flow has the same magnetism._
That was amazing video
Very good video!
How you are telling one after another like water flowing in the river? I love your expressions.
Great video. Love this show!!!!!!!! :D
such a good explanation, I see so many teachers having it completely wrong
wonderful presentation. an animated presentation on flow of AC would help all of us
Can't wait fo optics
I just got the script for it :)
-Nick J.
Awesome! Just want to thank you for all the fantastic videos and support but just wondering if you guys are still doing the Vlogs on patreon ? The last one was for August.
how about modern physics
Optics! My least favourite subject in physics! I couldn't wait to get that unit over with in first year. Learning about light in terms of quanta of light and energy, seems much more interesting than the ray theory of light. But what ever floats your boat!
Bring on modern physics and the photoelectric effect!!
Trevor Schmahl yep mine too
thank u that was useful
When I studied electronic theory in Australia in the 1990’s from day one we were taught current flow -ve to +ve and that “convention flow” used only by automotive electricians. I have also read USA circuit books that show -ve to +ve flow in an electronic circuit. Try to explain thermionic emission with conventional flow or to describe the working of a solid state circuit.
So we are going to ignore the fact that Locutus of Borg shows up when talking about resistance? Great video!
I'm one year away from becoming electrical engineer I just wanted to watch anyway. I use the river metaphor aswell to explain electricity.
Thank you. It was very good and in detail. I could like to suggest if there was any equation introduced afterwards stop just a second to let someone,like me not that clever, to think for understanding and absorbing it. Sometime, there were few crucial points came together so fast, I could miss or forget some important points. That was a waste of such a good lesson for losting the treasure in split second☹
Congratulations on 10 million subs btw.
So much better than the previous episode.
very nice
I love this channel
Watching this for fun
Amol Gupta +
Darkstar22 I want...
Good thinking
I LOVE YOU.
Luv you...so awesome content........😋
So glad I put on notifications ^^
you are a genius thank you
Ahktuallyy, Ohm's law is related to the proportionality between electric field density through an ohmic material and the electric field, R = V/I is a result of that hehe *snort* he
This is cool
thank ya
This was uploaded after my physics finals -.-
I cant get over how fast shes explaining this
Lol im having to do these bc we aren't in class to do them
same here!
@@Emily-et3ur Yep. Online school sucks.
same
who knew the dark lord had to go to school
@@Pedrammotahari XD
Same
anyone who dislikes this video then.. well... they must just be too stupid to appreciate the knowledge this video shares
My history teacher last year always shows us his crashcourses
I have always taught electrical current as trucks on a road! but visualising current really helps understand electricity
The drawing of diode show an arrow pointing toward negative, like if electricity was flowing from positive.
The mistake comes from electro-plating and arc lamps. In both cases, we can not see the tiny electrons flowing from negative to positive but see the much larger atoms/molecules (or ions) flowing from the positive side of the arc lamp or the metal elements attaching to the negative electrode.
Ok i'm more confused than before. At 3:01 you say something about positive like charge particles flowing from the positive side of the battery.
What thing is flowing from the positive side? Maybe my English is not that great but it seems both positive and negative particles meet that the light bulb.
:) thanks for teaching me
liked the sub-zero cameo :)
There is absolutely no need to provide a ground. There are reasons to, but there are also as many reasons not to in certain circumstances.
"To solve this problem, Italian scientist Alessandro Volta invented the first voltaic cell"
hahaha
To solve this problem
dîslke
5:14 Sub-Zero (MK)
2:00 Errr....batteries dont need to be grounded. (how would phones work?). Anybody thats ever played around with basic electronics will tell you this. But I know it's unrealistic to expect you guys to have experience in every topic you make a video of and I still love your work :)
You are a genius
will there be a part about alternating current too? i got some burning questions about that. in school i am tought that resistance is a constant AND wattage is a constant, but if you crank up the voltage, how does the amperage behave? if it follows the resistance it gets higher, if it follows the wattage it gets lower :S i'm starting to think wattage isn't that constant at all and my school is lieing to me :S
I love the puns, they are very..... PUNNY
This course is the hardest crash course!! But still a wealth of information, at least when humanity is reduced to cavemen after nuclear war, we will have a resource to start building again xD
Matt Goorahoo oh yh, because cavemen had computers and the internet
Funny thing she was speaking too fast so I slowed down there video, didn't understand anything ( I know I'm dumb) but when I speeded up the video and watched it twice stuff became clearer.
BTW great video!!👍
Jumping around the subject like hopscotch
Thanks again crash course! I just have to say i'm actually comfortable with the speed. Physics always puts me to sleep because the other vids are slower than this. Please keep up the good work,
*yOu FiNe KeEp GoInG*
could you make a video on superconductivity?☺
So based on ohms Law V=IR, Resistance of a system should increase when voltage increase provided the current is constant. But is this really possible?
All the 46 videos(maybe43 of them) are my grade 11 and grade 12 almost the full syllabus(last 2 years of high school)
Is this the syllabus in countries like Australia or England ??
I want to know
The Iran batteries are thousands of years old??? Nice informative video!!!
wow, thanks
great
I hope you guys do AC
and hopefully transistors too. I've found that hard to understand. I've taken so many courses in that though
dheeraj anything you dont understand, just ask! I will either answer directly or point you towards a nice video, I used to have the same problem 2 years back, and now I know everything about them
Power Max woah calm down, your going to give some new learners phobia ;)
I know, Right! ;P Not to worry though, engineers find ways to avoid the parasitic effects and operate within the better-behaved regions of these devices! It makes the math and the analysis super easy! (much of this stuff is simulated anyways!) OR so I'm told :|
Chemically speaking what makes voltage? I mean if i had two voltaic cells connected in series voltage add up, so whats the difference chemically between one voltaic cell and two voltaic cells connected in series
I saw you in a Spanish tv programme about the world’s biggest ships and which one was the best