Electric Current: Crash Course Physics #28

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  • เผยแพร่เมื่อ 16 พ.ย. 2024

ความคิดเห็น • 566

  • @crashcourse
    @crashcourse  ปีที่แล้ว +13

    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

  • @fluffyrawan7656
    @fluffyrawan7656 6 ปีที่แล้ว +265

    These "fast" videos are perfect for reviewing and getting everything neat and simple in ma brain after the lesson.

  • @victorcachat
    @victorcachat 8 ปีที่แล้ว +1023

    Very well done, bravo. Still have no idea how electricity works though, but that's just because I'm not very.. bright.

    • @MeanieTV
      @MeanieTV 8 ปีที่แล้ว +38

      Victor Cahat to better understand it you'll have to learn how atoms work.
      to put it short, electricity flows through electrons.

    • @namjoonxx398
      @namjoonxx398 7 ปีที่แล้ว +29

      Victor Cahat I see what you did there ...

    • @ltjyx
      @ltjyx 6 ปีที่แล้ว +4

      Same, I know the feels.

    • @prathamkapoor537
      @prathamkapoor537 6 ปีที่แล้ว +8

      Victor Cahat get out

    • @victoriaolympiatziamtzis8830
      @victoriaolympiatziamtzis8830 6 ปีที่แล้ว +13

      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.

  • @LoganAKASpiderhands
    @LoganAKASpiderhands 7 ปีที่แล้ว +424

    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.

    • @harishks99
      @harishks99 6 ปีที่แล้ว +3

      Nice

    • @ahmedhawz7283
      @ahmedhawz7283 6 ปีที่แล้ว +2

      noice

    • @beawesome2464
      @beawesome2464 5 ปีที่แล้ว +1

      👍😁😁😂😂

    • @amakae.5853
      @amakae.5853 5 ปีที่แล้ว +1

      Niceee

    • @SpudRusset
      @SpudRusset 4 ปีที่แล้ว +6

      SP Plays I normally watch educational stuff on 2x speed anyways so I didn’t even notice.

  • @SomyaJain
    @SomyaJain 4 ปีที่แล้ว +440

    she has a lot of potential to be a rapper

  • @kushagrasharma6541
    @kushagrasharma6541 6 ปีที่แล้ว +275

    Stop spilling hate the name is 'CRASH COURSE' for a reason. It is fast on purpose

    • @therasaarul
      @therasaarul 5 ปีที่แล้ว

      Wow

    • @gabem9626
      @gabem9626 5 ปีที่แล้ว +22

      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 😒

  • @daemn42
    @daemn42 8 ปีที่แล้ว +208

    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.

    • @MrHeHim
      @MrHeHim 8 ปีที่แล้ว +12

      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.

    • @benaaronmusic
      @benaaronmusic 8 ปีที่แล้ว +2

      Very interesting. Thanks.

    • @whatever3041
      @whatever3041 5 ปีที่แล้ว

      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.

    • @MrBendybruce
      @MrBendybruce 5 ปีที่แล้ว

      @@whatever3041 But they still move glacially slow compared to the electrical current, which is very close to c, right?

    • @Pyrodeity42
      @Pyrodeity42 4 ปีที่แล้ว

      @@whatever3041 this doesn't apply for electron moving through a conductor right

  • @pranjal3730
    @pranjal3730 7 ปีที่แล้ว +456

    turn down for watt 😂😂

  • @aaryan6577
    @aaryan6577 6 ปีที่แล้ว +27

    Wow her explanation is just so good! No one can ever explain things like her and with such passion and enthusiasm.
    Simply loved it

  • @oregongebus6290
    @oregongebus6290 8 ปีที่แล้ว +101

    I think that crash course music theory would be a good topic.

    • @RPGraid
      @RPGraid 5 ปีที่แล้ว

      i agree

  • @KingsleyIII
    @KingsleyIII 8 ปีที่แล้ว +101

    This was a _shocking_ episode!

    • @SamuelEstenlund
      @SamuelEstenlund 8 ปีที่แล้ว +19

      At the current state, it has potential to be the most shocking of all episodes.

    • @SamuelEstenlund
      @SamuelEstenlund 8 ปีที่แล้ว +16

      The power was too strong to resist for me.

    • @TorquemadaTwist
      @TorquemadaTwist 8 ปีที่แล้ว +14

      You need to improve your capacity to avoid puns.

    • @MuhtasimFiroz
      @MuhtasimFiroz 7 ปีที่แล้ว +13

      Watt are you guys on about?

    • @cindyt6925
      @cindyt6925 7 ปีที่แล้ว +18

      OHM-mygosh. If we don't all stop soon, we'll get PUN-ished.

  • @doso4782
    @doso4782 5 ปีที่แล้ว +13

    Watt the heck? Never expected such current and up-to-date info. This video is like a joule because it’s so great.

  • @Activsoul
    @Activsoul 6 ปีที่แล้ว +8

    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.

  • @bilgekocak262
    @bilgekocak262 6 ปีที่แล้ว +152

    Guys make the speed 0.75, there's a button you know

    • @mahbuburrahman8997
      @mahbuburrahman8997 4 ปีที่แล้ว +4

      tnx, very helpful for non native english speakers like me!!!

  • @robotaholic
    @robotaholic 8 ปีที่แล้ว +41

    wow this went way over my head lol

  • @catriziacat1756
    @catriziacat1756 4 ปีที่แล้ว

    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

  • @tanyay1073
    @tanyay1073 8 ปีที่แล้ว +63

    "Turn down for Watt?" 😂

  • @sreshta_7861
    @sreshta_7861 4 ปีที่แล้ว +75

    Me reading all the comments saying she talking too fast listening on 1.25 speed 👂👁👄👁👂

  • @BasedBenny
    @BasedBenny 8 ปีที่แล้ว +15

    I like her accent

    • @asimplecephalon1632
      @asimplecephalon1632 6 ปีที่แล้ว +1

      It's just a standard middle-class English accent.

  • @freddiea3564
    @freddiea3564 8 ปีที่แล้ว +4

    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!

  • @rkpetry
    @rkpetry 8 ปีที่แล้ว +1

    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._

  • @Tommykee999
    @Tommykee999 8 ปีที่แล้ว +26

    who ever invents a room temp super conductor is gonna be rolling in money

    • @xiLoveYouix
      @xiLoveYouix 8 ปีที่แล้ว +5

      tommy tran probably not. The patent will be owned by the uni or company they are conducting the research on behalf of

    • @nitinsrinivas7033
      @nitinsrinivas7033 7 ปีที่แล้ว

      tommy tran I

    • @turtlefeesh
      @turtlefeesh 4 ปีที่แล้ว +1

      @@xiLoveYouix unless they're the founder of their own electricity company

  • @9alt0
    @9alt0 7 ปีที่แล้ว +3

    Man, so much work goes into making this.. thank you!

  • @spruce_goose5169
    @spruce_goose5169 5 ปีที่แล้ว +5

    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.

  • @brandonmcgovern5290
    @brandonmcgovern5290 8 ปีที่แล้ว +1

    I like this host's enthusiasm.

  • @imakeadifference2011
    @imakeadifference2011 8 ปีที่แล้ว +839

    either I'm really dumb, or she's going really fast

    • @phucnguyen-yf4um
      @phucnguyen-yf4um 8 ปีที่แล้ว +23

      you were right, i didnt catch a few words when she's speaking

    • @LAductions
      @LAductions 7 ปีที่แล้ว +7

      nah, she is going way too fast...

    • @crystalsomething7234
      @crystalsomething7234 7 ปีที่แล้ว +11

      She is going quite fast I can't keep up with what she's saying. this video didn't really help me...

    • @kusurugizeme
      @kusurugizeme 7 ปีที่แล้ว +32

      I tried playing at .75 speed, she sounded drunk as hell.

    • @stanstanminsonfrancisco8645
      @stanstanminsonfrancisco8645 7 ปีที่แล้ว +11

      all you need to know really is that v=ir with i being current and r being resistance

  • @mohammedhikmat9519
    @mohammedhikmat9519 6 ปีที่แล้ว +18

    SHE CONFUSED ME EVEN MORE, THIS ELECTRICITY THING DOES NOT ENTER MY MIND. SO COMBLICATED

  • @VictorCaldo
    @VictorCaldo 8 ปีที่แล้ว +1

    I LOVE YOU.

  • @adityahegde4560
    @adityahegde4560 6 ปีที่แล้ว +9

    Wow! I learned in 8 and a half minutes what took me about an hour to learn!!! These are quite good videos!!!

  • @dxstiny.shawano
    @dxstiny.shawano 7 ปีที่แล้ว

    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.

  • @elishamaytopia4517
    @elishamaytopia4517 5 ปีที่แล้ว +2

    this video plays in my head during my exams :D
    thanks CrashCourse!!

  • @Intabih
    @Intabih 4 ปีที่แล้ว +1

    So we are going to ignore the fact that Locutus of Borg shows up when talking about resistance? Great video!

  • @Notentertain
    @Notentertain ปีที่แล้ว

    I cant get over how fast shes explaining this

  • @jordankong3105
    @jordankong3105 5 ปีที่แล้ว

    So much better than the previous episode.

  • @cc9334
    @cc9334 5 ปีที่แล้ว +1

    Jumping around the subject like hopscotch

  • @PeacefulAnxiety
    @PeacefulAnxiety 8 ปีที่แล้ว +58

    Can't wait fo optics

    • @crashcourse
      @crashcourse  8 ปีที่แล้ว +10

      I just got the script for it :)
      -Nick J.

    • @PeacefulAnxiety
      @PeacefulAnxiety 8 ปีที่แล้ว +1

      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.

    • @oldcowbb
      @oldcowbb 8 ปีที่แล้ว +3

      how about modern physics

    • @TrevorSchmahl
      @TrevorSchmahl 8 ปีที่แล้ว

      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!!

    • @muhtasimfuad1945
      @muhtasimfuad1945 7 ปีที่แล้ว

      Trevor Schmahl yep mine too

  • @Maria-nu5yo
    @Maria-nu5yo 7 ปีที่แล้ว +10

    These videos are so good. Thank you so much Crash Course & PBS!!

  • @BarisPalabiyik
    @BarisPalabiyik 8 ปีที่แล้ว +1

    I'm one year away from becoming electrical engineer I just wanted to watch anyway. I use the river metaphor aswell to explain electricity.

  • @gandalfstormcrow7888
    @gandalfstormcrow7888 6 ปีที่แล้ว

    Finally an explanation with good animation and narration !

  • @LectureCube
    @LectureCube 7 ปีที่แล้ว +4

    such a good explanation, I see so many teachers having it completely wrong

  • @alexfido2935
    @alexfido2935 8 ปีที่แล้ว +4

    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

  • @banajadandasena4142
    @banajadandasena4142 6 ปีที่แล้ว

    How you are telling one after another like water flowing in the river? I love your expressions.

  • @bobfl42
    @bobfl42 8 ปีที่แล้ว

    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.

  • @amol1gupta
    @amol1gupta 8 ปีที่แล้ว +19

    Watching this for fun

  • @botsunny013
    @botsunny013 8 ปีที่แล้ว +7

    This was uploaded after my physics finals -.-

  • @DonotWorryIAmHere
    @DonotWorryIAmHere 8 ปีที่แล้ว +1

    You guys are the best!

  • @PacRimElectric
    @PacRimElectric 8 ปีที่แล้ว +1

    thank you for the video....I had to watch more than 3 times.....there is lots of useful information in 8 minutes

  • @moltenshard
    @moltenshard 2 ปีที่แล้ว +1

    Thank you! This video was very useful to me 😀

  • @moiquiregardevideo
    @moiquiregardevideo 7 ปีที่แล้ว

    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.

  • @jezz1217
    @jezz1217 8 ปีที่แล้ว

    My history teacher last year always shows us his crashcourses

  • @swaritt2777
    @swaritt2777 6 ปีที่แล้ว

    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!!👍

  • @rearviewmirror6810
    @rearviewmirror6810 4 ปีที่แล้ว

    Congratulations on 10 million subs btw.

  • @Maxo11x
    @Maxo11x 8 ปีที่แล้ว

    I have always taught electrical current as trucks on a road! but visualising current really helps understand electricity

  • @UpUpAboveSky
    @UpUpAboveSky 8 ปีที่แล้ว +6

    I love this channel

  • @charmio
    @charmio 8 ปีที่แล้ว

    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 :)

  • @letsgetreal2501
    @letsgetreal2501 6 ปีที่แล้ว

    Awesome video

  • @niaschim
    @niaschim 7 ปีที่แล้ว +5

    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🙁

  • @tanyagray5246
    @tanyagray5246 5 ปีที่แล้ว +1

    you are a genius thank you

  • @saraashlyn9364
    @saraashlyn9364 4 ปีที่แล้ว +27

    Lol im having to do these bc we aren't in class to do them

  • @satyabanukil779
    @satyabanukil779 6 ปีที่แล้ว

    wonderful presentation. an animated presentation on flow of AC would help all of us

  • @electriciandiary2568
    @electriciandiary2568 ปีที่แล้ว

    very nice

  • @revcrussell
    @revcrussell 8 ปีที่แล้ว +2

    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.

  • @suryakantajana5415
    @suryakantajana5415 ปีที่แล้ว

    Good thinking

  • @kareemmohammed7608
    @kareemmohammed7608 4 ปีที่แล้ว

    thank ya

  • @LutherusPXCs
    @LutherusPXCs 8 ปีที่แล้ว +15

    I hope you guys do AC

    • @DheerajBhaskar
      @DheerajBhaskar 8 ปีที่แล้ว +1

      and hopefully transistors too. I've found that hard to understand. I've taken so many courses in that though

    • @AMalas
      @AMalas 8 ปีที่แล้ว

      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

    • @AMalas
      @AMalas 8 ปีที่แล้ว +1

      Power Max woah calm down, your going to give some new learners phobia ;)

    • @power-max
      @power-max 8 ปีที่แล้ว

      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 :|

  • @artigarg4269
    @artigarg4269 4 ปีที่แล้ว

    You are a genius

  • @ashrafulalam3662
    @ashrafulalam3662 6 ปีที่แล้ว +1

    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

  • @InvisibleCitizen
    @InvisibleCitizen 5 ปีที่แล้ว

    The Iran batteries are thousands of years old??? Nice informative video!!!

  • @luciaa1980
    @luciaa1980 6 ปีที่แล้ว

    I saw you in a Spanish tv programme about the world’s biggest ships and which one was the best

  • @bobbymavrov9273
    @bobbymavrov9273 5 ปีที่แล้ว

    That was amazing video

  • @azizarian5016
    @azizarian5016 5 ปีที่แล้ว

    thank u that was useful

  • @facundocorradini
    @facundocorradini 8 ปีที่แล้ว +3

    Keeping the videos short is generally good for the internet..,. but trying to rush in physics is not good at all. Specially speakingreallyfast. If you could slow down the pace, that'd be great.

  • @samirtembulkar
    @samirtembulkar 8 ปีที่แล้ว

    Great work...

  • @celinehosea
    @celinehosea 6 ปีที่แล้ว +1

    I love your videos, they are very informative! However, I do recommend speaker a little bit slower, as it would be easier for students to digest everything clearly.

  • @beachbum0014
    @beachbum0014 8 ปีที่แล้ว

    Very good video!

  • @ihartevil
    @ihartevil 8 ปีที่แล้ว

    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

  • @martinasera825
    @martinasera825 5 ปีที่แล้ว

    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*

  • @sutapagoswami116
    @sutapagoswami116 6 ปีที่แล้ว

    I love watch crash Course videos, ur for physics,100% of the time I’ve found myself like this-
    Before watching - maybe I should watch a crash course video for better understanding l the good graphics would help 🤔😌
    First two minutes - ooooo interesting
    5 minutes - ok... this is not my syllabus never mind, I’ll see , this is interesting
    *watches for 50 seconds*
    *sees numbers and formulaes*
    Ok! Who the hell was I kidding! 😝

  • @THEO-np1fv
    @THEO-np1fv 5 ปีที่แล้ว +1

    I love the puns, they are very..... PUNNY

  • @mattdangerg
    @mattdangerg 8 ปีที่แล้ว

    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

    • @xiLoveYouix
      @xiLoveYouix 8 ปีที่แล้ว

      Matt Goorahoo oh yh, because cavemen had computers and the internet

  • @kploo4906
    @kploo4906 6 ปีที่แล้ว

    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☹

  • @MichaelDiezFeed
    @MichaelDiezFeed 8 ปีที่แล้ว +1

    liked the sub-zero cameo :)

  • @ishalhuds4902
    @ishalhuds4902 8 ปีที่แล้ว

    wow, thanks

  • @picklespickles4073
    @picklespickles4073 ปีที่แล้ว

    This is cool

  • @photosinensis
    @photosinensis 8 ปีที่แล้ว

    Now if only I knew enough about AC to understand how an antenna works.

  • @louayGamer
    @louayGamer 7 ปีที่แล้ว

    Thank you :D very nice work

  • @nekonekomomo
    @nekonekomomo 7 ปีที่แล้ว +1

    5:14 Sub-Zero (MK)

  • @rayyana723
    @rayyana723 6 ปีที่แล้ว

    anyone who dislikes this video then.. well... they must just be too stupid to appreciate the knowledge this video shares

  • @glitch2.087
    @glitch2.087 6 ปีที่แล้ว

    This is a place for people who have intrest in learning phusics....if ur intrsted her speed doesnt matter

  • @snighdhashaw978
    @snighdhashaw978 7 ปีที่แล้ว

    Turn down for watt😂😂😂....btw I love that neon green lipstick 😂😂

  • @jekiahbab6173
    @jekiahbab6173 4 ปีที่แล้ว +1

    Dobar dan profesorice gledamo video

  • @chroma9848
    @chroma9848 6 ปีที่แล้ว +7

    First I didn't know WATT, but now I CURRENTly know how POWERful electricity is.

  • @michellejacob999
    @michellejacob999 6 ปีที่แล้ว

    This is a great video. It's really helpful.

  • @waltercomunello121
    @waltercomunello121 5 ปีที่แล้ว +4

    0:23 Electric current [through a component] is the total amount of charge passing through [that component] over a [given] period of time. Some slight oversights here but nothing too weird.
    2:01 "This is just a common conductor that ensures that current always has a path to a large reservoir of charge, usually the Earth itself." Ok, and exactly why do we need a grounded connector? Would this short out the battery and not deliver any power to the lightbulb at all since charges always tend to follow the path with the least resistance? What if the negative terminal of the battery had a potential of -100 V? Would current still flow to Earth? Why do most portable appliances not have a ground connector whatsoever, although they do host energy cells? What does this mean?
    Crash course, alright, but lacking of proper information has nothing to do with it being fast. Lots of video on TH-cam where current is explained way better.

  • @redwoodoriginal9004
    @redwoodoriginal9004 6 ปีที่แล้ว +1

    Instead of complaining about the speed why don't you just slow it down or rewatch parts of/ the whole video a few times until you understand it, she's explaining some pretty complicated principles so take your time with it, you almost never actually learn anything by seeing it once.

  • @LinasWizz
    @LinasWizz 6 ปีที่แล้ว

    Her talk speed is just perfect. Slowdown youtube player or repeat to slow down

  • @vrstovsek
    @vrstovsek 8 ปีที่แล้ว

    WOW... Kleopatra knows her stuff!

  • @chinmoydas9310
    @chinmoydas9310 5 ปีที่แล้ว

    Excellent video.

  • @govorilegko
    @govorilegko 8 ปีที่แล้ว +1

    "To solve this problem, Italian scientist Alessandro Volta invented the first voltaic cell"
    hahaha
    To solve this problem
    dîslke

  • @francismannion7075
    @francismannion7075 7 ปีที่แล้ว

    That was great! It was informative and a lot of fun.