Electric Charge: Crash Course Physics #25

[@crashcourse]

We made quiz questions to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/3TW06aP

[@Mekryd]

Does the sound dim at random points for anyone else? It's like someone muffled the mic arbitrarily.

[@sergwaynecorbray940]

Mekryd As soon as I read this it happened

[@100zuhaibriyaz5]

Yeah, it happened

[@chamathsaraliyanage4556]

Yep

[@nicoletacociug8708]

Mekryd I think it’s because you are receiving messages

[@saumitup6524]

I thought I got some notification on my phone

[@bartu971]

She has a lot of potential to become a rapper

[@ophist8399]

AdjacentTie Why is it because her hair can be turned into a rapper?

[@dysfrvr738]

i think bartu is saying that because she talked fast

[@dna7767]

you guys are dumb lmao its cause she talks fast jesus

[@yuno3807]

OMG RACIST

[@class12c84]

guys its not she is talking fast!!!they have edited the video to fast mode....

[@ZDanimations]

she makes 10000 times more sense than my professor, who didnt explain anything and just started writing equations on the board.

[@mexheix]

exactly what my professors do all the time.

[@AlexandreG]

I feel you

[@SanjayKumar-ew3xq]

bekar sir ha

[@varshinishanmugakumar2729]

I'm feeling also feeling the same way!

[@JohnSmith-rj2yt]

Stop this god damned meme.

[@elodie6662]

These videos are saving physics students lives' every single day

[@darkwisteria9120]

When your physics teacher doesn't teach you physics so you rely on the internet

[@shan49618]

sad but true.

[@lcy1hot]

relatable

[@zhouwang9508]

agreed

[@yon321]

Lol that's me 😂😂

[@Shay-ul2bg]

But im here because I dont even have a teacher

[@annybevilacqua6181]

Just some timestamps to help the future me rewatch this video :) 0:00 - Intro 1:18 - Electrical charge 3:09 - Law of Conservation 5:40 - Charge (q) & Coulomb’s law 7:30 - attraction & repulsion between charges

[@iamkocka6457]

When you try the tape thing and feel like a scientist.

[@ignaciob]

Electronic engineer here…You just explained static electricity better than all my teachers in university. The topic can be very confusing for beginners. This course gets better every time!

[@MichaelNatrin]

This is a better explanation than I've heard in any college physics/engineering course. Thanks.

[@ricardo.mazeto]

I want a "Crash Course - Physics History", telling us about how all everything was discovered.

[@MrDobby28]

nerd

[@pivotal-ai]

@Ricardo I support this!

[@MrValkyr1e]

YES PLEASE! :3

[@thugnasty3076]

Neil Tysons Netflix series cosmos does very well with that, but only with a few

[@MrDarthvaderlikespie]

apple fell on isaac newtons head the end

[@zieleke07]

"giving the amber an overall POSTIVE CHARGE" also amber: *sad face

[@charlesfernandez201]

.

[@blpanick]

for some reason it made me sad when the fur stole the electron from the amber

[@elodie6662]

same.... mean fur....

[@shanzanaveed5452]

Me same

[@z-e-r-o-]

3:01 I became anti-fur

[@kurdtc0bainlistener]

Hahaha 😂 I'm so sorry I'm laughing so hard

[@aksharaa5376]

poor amber D:

[@linmonPIE]

I want to tell her it's okay to take a second to breath!

[@Sophistry0001]

Everything is a conductor when there is high enough potential. Also what are the odds of getting a mini crash course series on electricity alone? There is so much content, from basic theory, AC vs DC, current, motors / generators, different kinds of load on a circuit, different electrical components ect.

[@frankschneider6156]

+Matt T Or if you just make it hot enough (e.g. glass becomes an excellent conductor, when heating to its melting point)

[@FeraleHubbard]

I love how Crash Course videos explain a weeks of physics lectures in under 10 minutes in a way that we can understand. Thank you!

[@DrE2555]

yep I'm failing physics class

[@dome6356]

Did you fail

[@shishirbagchi249]

@@dome6356 good question

[@draganalexandru6912]

but did you fail tho?

[@adrianamunguia9887]

Eduardo Freitas I wish they would have let the guy do this series, she’s so bland and reading off the board and the sound quality is muffled at points. This sucks 😭

[@PUTURHANDSintheair22]

3:03 why am I dying at the animation at the bottom lmao

[@abdi3672]

same 😂. maybe its the slap? 😂

[@bobgatewood5277]

these crash courses have teached me complex and extensive subjects in a matter of days, waaay better than even college teachers

[@KingsleyIII]

3:56-4:00 and 7:57-8:00. The audio becomes quiet for a few seconds.

[@BlueyMcPhluey]

I thought it was just me

[@fossilfighters101]

+

[@sucdeep]

Its probably editing problem

[@tejasmenon8643]

Wth ...you can still listen......then what's your problem mofos

[@vickanis2234]

who cares

[@delta8479]

your channel doing a math course would be such fun! I love learning through this videos because everything sounds easy and the people giving the course looks so happy while filming! everything about this makes you want to learn more and more!

[@CrazyShepard]

That poor lil Copper just wanted his Electron buddy back.

[@trailoverland6462]

this is the best comment in this thread

[@LPSwimmer2011]

*Amber

[@CrazyShepard]

LPSwimmer2011 Why would Amber be conducting electricity?

[@LPSwimmer2011]

Andrew Swart Why would fur?

[@jaydenh5748]

Andrew Swart It wasn't even conducting electricity.. it was neutral

[@NoahNobody]

This would be a great introduction for a Crash Course Electronics series. I really think you guys do a great job explaining complicated things, simply.

[@emmadong7987]

When your "teacher" teaches you for three classes and you have the unit test next class

[@soupman4315]

When your first name isn’t isawkonlong 😓

[@ohlookadandelion]

I AM FOREVER GRATEFUL TO THIS CHANNEL FOR CLEARING ALL MY DOUBTS

[@muskansiddikee2171]

A good physic teacher can make you fall in love with physics and she did it like a pro.

[@DoeiDenise]

I found that quite difficult to follow but her calm and joyful way of explaining things helps a lot!!

[@TheRealE.B.]

That was a pretty cool animation with her fingers repelling the electrons.

[@chastaine813]

I am at a cafe watching this with headphones on and at 2:32, a bunch of people walked in behind me.... fml

[@Apathy474]

Lol ikr watching this in class and people see that XD

[@yoyoclockEbay]

I want her to polarize my rod. I'd definitely give her some of my free electrons.

[@shantanuthakur6081]

Good sense of humour

[@hanifzahidin2036]

+yoyoclockEbay dude WTF...... xD

[@coltonkersting8003]

@@yoyoclockEbay Same

[@jerrinmathewgeorge4186]

Letme me just say.. The intro music is 🎶🎶🎶🎶❤️🎶❤️🎶❤️🎶❤️🎶❤️❤️Epic... ... Tututu tuu Tututu tuuu 🚉

[@girffes3287]

Dude, these videos are what's getting me through IB Physics right now

[@spicyweasel]

Randomly selected this video and found out that it is the same thing I learned today in Physics Class! And btw the video was fantastic!!

[@Soochoup]

that would be awesome to have crash course history for each equation popping on the screen. Just to know how these equations had been found and all, not just accepting that this is reality and has always been

[@luismerchan8782]

3:02 omg that fur is so mean! 😔

[@Lyynity]

When we're saying that a piece of fur is mean What has my life come to.

[@fruittart3730]

@@Lyynity it's ok.. that was two years ago. Humans can't tell left from right these days 😖

[@shanzanaveed5452]

Yeah

[@z-e-r-o-]

Anti-fur movement arises

[@marushkadobradoidebr]

Just amazing. I just understood electric charge that my professor was trying to teach us in 2 hours and a half

[@danielvarga5020]

From ~3:58: If I know well, electric polarization is a shift of positive and negative electric charge in opposite directions within an insulator, or dielectric, and it occurs when an electric field distorts the electron cloud around positive atomic nuclei, so with metal you get maybe charge sharing (I don't know the english name of it) but not polarization...

[@samonellasgayclone1054]

i remember watching the walter lewin explanation and she basically did it in 9 minutes. simply amazing

[@twaamboshankoti3610]

Your videos are very helpful, I always look for a video on your channel first if there is something I don't really understand during a lecture. However, I would really appreciate it if you slowed down a little. Thank you. ☺️🌼

[@masonchapman5903]

i want tape now

[@keilavieyra1480]

I did the tape thing and it really worked, blew my mind. So cool. She should do labs to...... I rarely see the point behind labs.

[@kfir_krak]

So glad you started Electromagnetism! Beautiful video.

[@batchprogrammer108]

I really want to thank you! I can't understand my teacher at all, and this made so much sense :)

[@jamesharmer9293]

What's up with the audio in this video ? It keeps dropping out.

[@ReuelRamos]

I thought I was having a stroke

[@Chloe..F]

I just thought my headphones were crapping out

[@alonsogomez6774]

It is easy to understand and you could learn about the positive and negative charges ,charges of the same sign repel each other, while charges of a different sign attract each other; that is, the electrostatic forces between charges of the same sign

[@NewNew-qn7kh]

Hahaha I have a test on this exact topic tomorrow and I forgot to bring home my physics book, thank you crashcourse you beauty

[@Furiends]

I think a more forward definition of static electricity is a difference in charge without a carrier. Two distinct systems (clouds and the wet ground) with a high resistance barrier (air).

[@MrJkaos96]

Really well explained, continue making this vids, they are geniunily awesome!

[@Teo117]

Coming back to it, an excellent amount of information in such a short time frame. Absolutely excellent!

[@laurenjane6471]

I was doing homework on this 20'minutes ago for physics 30, and then this popped up in my subscription box. Best timing ever I guess.

[@frank39pw]

impressive delivery. Great content. great graphics. I subscribed. Good Job!

[@mandyblank3310]

what are the odds of getting a mini crash course series on electricity alone? There is so much content, from basic theory, AC vs DC, current, motors / generators, different kinds of load on a circuit, different electrical components ect.

[@piyushkaushal4261]

Thank you very much for giving valuable information on Electric charge and Column's law.

[@trailoverland6462]

Something about this video is very special. I learned a few things too. Great work!

[@vanessam157]

I'm supposed to be reading my chem book for calorimetry and I'm watching this boiiiiiii

[@MusiCaninesTheMusicalDogs]

This was the most interesting video in the physics course so far. 👍

[@karlaalvaro6025]

The animations are adorable. I thought it was cute how the fur slapped the amber lol

[@franciscoromao3867]

I think there's a mistake when the coulomb's is being tested, it shows that the K = 9*10^-9 but it should be k = 9*10^9. I am right? Hope this helps. Amazing video and explanation. Thank you.

[@ronanmurphy98]

Excellent video, thank you!

[@stannelforbis9535]

at 4 mins in audio gets low

[@MartinPereira-qn2mt]

also at 7:58

[@alexanderkostadinov8080]

cus shes moving away from the mic to peek at her cheat sheet

[@MartinPereira-qn2mt]

yeah, but it is so easy to fix.... i think the editor doesnt like us

[@dojoo6188]

Jennifer Li n not mn mn. N Nh. No m mn n. N. M n m hmn. Meme. C ,d. Cld. Do d. Scseurcnjcdjndjskaksjcsjxnxncvbfeucncncisicncncnssisisisisisiissicnncccnncisisisisisiaoaoaoaoaoaoaoxjxjxjxjxxjxxnxxpornhu djdjxjxjxx x x xx. S x x x x x x. S x x x x x xx x x x x x x. X. Xjaajaajsjja

[@suryaravinder]

actually the mic is on her so even if she was looking at her cheat sheet it wouldnt matter because the volume would be the same

[@asiyadiriye3292]

This is such a productive and educational video thank you.

[@roryegc5294]

I have an exam coming up on some of this stuff soon, and thank you!

[@janineapb]

really wanted to complete this crash course physics playlist, but on every video halfway through I get sleepy lol her voice is soothing it makes me want to snooze off

[@thehuman6932]

I'd be happy more than anyone else if she becomes our physics teacher.......

[@evelynafenyi8889]

Question she said at 2:53 weather the the rod turns out positive or negative charge depends on the Material how does the material depend on that .

[@ulysses7157]

when taking high school physics. this was my favorite subject.

[@yourheadisround]

Come on Crash Course! I needed these a month ago!

[@shreshthadavi141]

Thanks a lot Crash Course! I was waiting for this topic of electricity to come along..

[@blissxfull_mxnchy292]

I'm doing a science electricity test tommorow! I use your videos to study.

[@Teo117]

I'm learning well. Please continue to educate me

[@jovas14rocks]

Blue balling for the next episode right now!!!!!!!!!!!!!!!!!!!!

[@Vessev]

This video explained this better than my Physics teacher. Thanks!

[@stellarfirefly]

1. When rubbing a glass rod with a cloth, why don't the excess electrons move into the person holding the object? And why don't those electrons then move from the person and into the positively charged object? 2. What determines which object gains electrons and which object loses electrons? 3. When people build up a static charge, how can they retain the charge to get shocked by something metallic? Why is the charge not immediately discharged into the ground?

[@michaelsommers2356]

1. Because glass and cloth are not good conductors (that is, they are insulators), which means that current does not flow easily, or at all, in them. 2. The nature of the material. Some elements give up electrons easily, others grab them easily. 3. Because they are isolated by insulators. That is, there is no conductor connecting them to something else that can take or give up electrons.

[@saeedbaig4249]

3. By insulators, do u refer to the floor and shoes and socks and stuff? So if I were to stand, barefoot, on bare Earth, would I be incapable of building up a static charge?

[@stellarfirefly]

Sideeq Mohammad I'm rather wondering that myself. I can understand being insulated by, e.g. soles of shoes. But then why can one discharge into a doorknob that is insulated from the ground by about half of a door, but not discharge into the wooden door itself?

[@saeedbaig4249]

stellarfirefly I'm assuming because wood is a poor conductor. Charge can easily flow from your skin to the metal doorknob. But I'm not an expert on this stuff.

[@Breyerlover4ever23]

Very good questions! I only know the answer to one of them, and that is 2. Some objects cling onto electrons while others give up electrons more easily. :-)

[@adamprice6009]

Do you know what happens if you break Coulomb's law? You get charged.

[@SPCCWHK]

It seems there are 2 mistakes. 1. Glass rods are insulators. How can they share charges? 2. When holding a metal rod with your hand, it has been grounded. How can it be polarized as one of the induced charges must go to the Earth instantly?

[@maximilianoredigonda8645]

At 3:25, why does the contact between the positive and the neutral rod transfers electrons? Aren't they glass rods, and thus, insulators? And if there is a reason for electrons to flow that way, why don't they travel through me and get "grounded", thus, neutralizing the charges?

[@eruiluvatar6688]

0:50 what makes one tape more negative than the other? What determines which tape gets the extra electrons and which tape gets oxidized?

[@arjenbij]

We need a music theory crash course!

[@macroscopes]

For "charged by contact" and polarization, I thought that if an electron was already "linked" to a proton it wouldn't be drawn to anything else.. The electrons go towards the area with more protons because the bigger positive charge breaks that attraction it had with that sole proton it was originally linked to? Great video though I would have liked to have it all explain from this point as it becomes even more fascinating.

[@katli4806]

"rendering the object electrically neutral" then why was the rod positive after grounding it?

Think it is relative to the negative object

[@dylanfiore3718]

because if you have the same number of electrons as protons.

[@dylanfiore3718]

you become neutral, neither the force of the electron or the force of the proton are greater or lesser.

[@melodywang5536]

That's what I was thinking too

[@josephwheelerton]

I was wondering the same thing. I think it's because she's still holding the negative glass rod near the metal one.

[@cmmndrblu]

The division by a square represents the lines of force as though they were taken as an integrated surface a particular distance from the centre of their emission, that is to say, the surface of an imaginary sphere. All equations where the strength of a force between two particles can be visualised in this way, and the strength of the force is the reciprocal of the distance between them. I wish someone had told me that in school

[@SupremiumYT]

Nice video

[@algaidi13]

thank you Crash courses team for all your efforts. please consider that not all the people watching videos on a specific topic are professionals in that field. I think that most of the people watching the videos on physics, for example, are from other back ground who are keen to expand their knowledge in physics. Also, do not forget that there are many people that are watching your videos do not speak english as their first language, despite the fact that they may completed a PhD degree in their speciality in a country which use english as first language i.e. their english is quite good. Therefore, please speak at slower pace so we can understand you from language and scientific perspetives. Sometimes I can easily notice that the presenters in your channel can not catch their breath.

[@mohammedc2806]

great work , thank you

[@aitv7144]

I believe there is a mistake at 6:09; the number of electrons per coulomb of charge is 6.25*10^18. But I find these videos very interesting, thank you.

[@chiefartificer7159]

Thanks a lot for this video. Good subject!

[@oliviasvahn4090]

Thank you thank you thank you ❤ I finally understood it 😁

[@reemooo2997]

thank you you help me so much and you explain it better than my teacher

[@dwightemorgan4367]

always informative

[@GeneralAmazing1]

It's like you know what Physics class I am currently taking. But decide to post helpful information after my test over it... 😪 ~I still appreciate it though

[@endoftimeendoftime3908]

Cool I got a final exam for physics tomorrow this helped a lot

[@mansirawat9500]

She a thousand times better than my teachers at high school!

[@erinm7469]

Thank you for posting this! I’m thankful for the internet

[@subhajitsingha1532]

REALLY LOVE THE WAY YOU DESCRIBE MAM.

[@marvinestrada6088]

How do electrons travel through the glass rods when they touch? Isn't glass an insulator? Electrons in insulators aren't free to move. Please help.

[@AlI-zt9bv]

These videos are SO HELPFUL!!!!! :)

[@futureDK1]

Crash course sociology please!

[@dickburns4126]

The Green brothers have this one video where words can hurt feels. That's kind of sociology?

[@darknightofthesoul8980]

Do they state that you can choose to not let them hurt?

[@dickburns4126]

"No. Words can butthurt." - Hank Green

[@LyssandraNorton]

+

[@TheMitchy27]

you have gotten your wish!

[@SAISRIKAR2002]

What is charge in the first place? I've been learning from various tutorials and everybody directly goes to positive and negative charges without actually discussing what CHARGE is. People just take it for granted without actually understanding what it means!

[@skyr8449]

7:58 volume change scared me to death

[@alvinchan4043]

For 7:05, the Coulomb's constant should be 8.991804694*10^9 instead of 9*10^9.

[@alinachen8683]

Using Coloumb's Law, the denominator is r^2 (with r being the distance between two objects). However, what if force is created by two objects coming in contact - wouldn't the distance between them be 0? Would the charge just be 0, instead?