Boolean Logic & Logic Gates: Crash Course Computer Science #3

Today, Carrie Anne is going to take a look at how those transistors we talked about last episode can be used to perform complex actions. With the just two states, on and off, the flow of electricity can be used to perform a number of logical operations, which are guided by a branch of mathematics called Boolean Algebra. We’re going to focus on three fundamental operations – NOT, AND, and OR – and show how they were created in a series of really useful circuits. And its these simple electrical circuits that lay the groundwork for our much more complex machines.

*CORRECTION* AT 1:27 the graph says “Quinary System” but then the graph shows 10 possible states – which is actually decimal. Technically, there should be only 5 possible values there, but the overall concept is still the same.

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50 Comments

  1. Beka Firefox on December 19, 2020 at 10:10 pm

    Haha, that was brilliant. Congrats on the team who thought of this. Amazing!

  2. D D on December 19, 2020 at 10:11 pm

    Superb

  3. R Two on December 19, 2020 at 10:12 pm

    I wish I could kiss you angel

  4. TechStuff on December 19, 2020 at 10:13 pm

    This was taught incredibly well

  5. reinis z9 on December 19, 2020 at 10:13 pm

    what?

  6. Samuel Saenz on December 19, 2020 at 10:13 pm

    The Boolean logic to try and use it for philosophy in finding truth reminds me of the logical positivists and their verificationism. It is interesting that it was refuted and not shown to be a tenable position, but it is easy to see why people would hope to find a method that way in search of truth.

  7. JoeAtko 30 on December 19, 2020 at 10:14 pm

    This is soo good

  8. Josh Greene on December 19, 2020 at 10:16 pm

    interesting genes

  9. Rubens Alves on December 19, 2020 at 10:16 pm

    BRO HOW I LOVE LOVE THIS COURSE

  10. Julian Lopez on December 19, 2020 at 10:18 pm

    Bruv, I’m just tryna build a Piston door in Minecraft

  11. Drobotics on December 19, 2020 at 10:18 pm

    I love everyone at crash course!

  12. Wim Kuijpers on December 19, 2020 at 10:25 pm

    5:57 More than 1,300 responses and no one knows Margaret Hamilton? (Apollo Guidance Computer).

  13. Hawk eye on December 19, 2020 at 10:25 pm

    For the people who disliked this video, I wonder what they exactly disliked about it….as i couldn’t find anything to dislike…..

  14. Any Caroliny on December 19, 2020 at 10:28 pm

    Amazing content, love it!!
    🇧🇷🇧🇷

  15. Matthew Ascough on December 19, 2020 at 10:28 pm

    this sucks i’m forced to watch it

  16. John Alexis Franco on December 19, 2020 at 10:30 pm

    Thanks! What a great episode. I still don’t get it 100% but I’ll keep going 🙂

  17. Youtube Chanel on December 19, 2020 at 10:30 pm

    and = reverse(inputs) nor
    or = reverse(inputs) nand

  18. Dwaipayan Datta Roy on December 19, 2020 at 10:32 pm

    Off switch has phases 5, 6,7,8 means what ? Partially off to completely shut ?

  19. eddiehimself on December 19, 2020 at 10:32 pm

    I mean the fact that George Boole came up with Boolean Logic a century before it became a vital component of designing computers is pretty incredible. It just goes to show how the discipline of pure mathematics, that is studying mathematics not for a practical purpose that is known at the time, but just for the sake of expanding the scope of maths itself, can really pay dividends when the technology catches up with it.

  20. Qx378 34 on December 19, 2020 at 10:36 pm

    Учусь в 11-ом классе, учу нулевую алгебру уже много лет и только сейчас понял, зачем он нужна

  21. Omar Abdelkader on December 19, 2020 at 10:36 pm

    0:50 Journey!

  22. Harley A.Garcia on December 19, 2020 at 10:37 pm

    Ah yes watching YouTube about how other things work like logic gates when I should be paying attention to Edgenutiy👌🏼

  23. Terumaske on December 19, 2020 at 10:38 pm

    Made me smile that they added the main character form Journey at 0:51

  24. Krishna Savaliya on December 19, 2020 at 10:40 pm

    here, question is you have a number or you wearing galsses as a hobby
    if you == number:
    print(‘you look amazing’)
    elif you == hobby:
    print(‘you also look amazing’)

  25. Dwaipayan Datta Roy on December 19, 2020 at 10:41 pm

    😁😎

  26. Aghiad Alzein on December 19, 2020 at 10:42 pm

    That was great , precise and more than simple ,thanks.

  27. Louis on December 19, 2020 at 10:43 pm

    Can someone tell me why the nand gate is not shown here?
    In the nandgame, the site give it as your first tool to build a circuit.

  28. CrashCourse on December 19, 2020 at 10:44 pm

    *CORRECTION* AT 1:27 the graph says "Quinary System" but then the graph shows 10 possible states – which is actually decimal. Technically, there should be only 5 possible values there, but the overall concept is still the same. NOTE: Since we can’t use annotations in our videos going forward if we find any smallish errors in our videos like this we’ll leave clarifications in the episode description. Thanks all for the wonderful feedback! -brandon

  29. Jameel Mahmood on December 19, 2020 at 10:44 pm

    Well done 👍

  30. Jay Malguitou on December 19, 2020 at 10:45 pm

    This table is upside down normally we would start with zeros so asuming that True is 1 and false is zero then false false false should be at the top of table, apart from that explanantion is great

  31. Sam Whiffin on December 19, 2020 at 10:48 pm

    This made me get more confused some how…

  32. Vinayagam K on December 19, 2020 at 10:49 pm

    I’m Carie Anne And I’m Sexy
    What statement is this And Oo Not?😊

  33. ByRuss X on December 19, 2020 at 10:49 pm

    0:50 Journey Criature

  34. Lady dexx on December 19, 2020 at 10:50 pm

    she talks way too fast !

  35. Felifluffy on December 19, 2020 at 10:50 pm

    THANK YOU, you teach so much better than my teacher.

  36. Protatodragon1 on December 19, 2020 at 10:51 pm

    Is that a rip-off intro of ted Ed?

  37. NIGHTMARE NOOB on December 19, 2020 at 10:52 pm

    I don’t get it ,in xor gate when current doesn’t go through the not gate ( when the not gate false) but it goes true then where from the current coming. And. Also in xor gate both A&B are true so the and gate open current true on not gate but it rusult false then where is the current gone. Please help me to find out this

  38. Your channel on December 19, 2020 at 10:52 pm

    You will never actually need this knowledge, you just learn the table

  39. Your channel on December 19, 2020 at 10:54 pm

    >chad
    >stacey
    needs a visit from Alek Missian

  40. nitin bisht on December 19, 2020 at 10:54 pm

    its interesting ans satisfying at the same time. Also shout out to your animator.

  41. shoyorolldeephalf on December 19, 2020 at 10:54 pm

    omfg thank you

  42. Angie Hollingworth on December 19, 2020 at 10:56 pm

    That was brilliant, thank you!

  43. Mike Tierney on December 19, 2020 at 10:59 pm

    Oh no! It’s the ever elusive incomprehensible, omnipresent infamous ‘THEY’! And they’re back! LOL. Better tell Fudge.

  44. Danny Figueroa on December 19, 2020 at 11:00 pm

    Found my second favorite teacher. My first is Jesus.

  45. Elhadji Amadou Toure on December 19, 2020 at 11:01 pm

    As much as I hate the complexity of these videos, I love how much I’m able to learn from them. And I believe I’m speaking for thousands.

  46. Jeffrey Ogodogun on December 19, 2020 at 11:02 pm

    Well done Carrie 👏🏽👏🏽👏🏽

  47. OrionTheWildHunt on December 19, 2020 at 11:04 pm

    does anyone else pause the video at the intro just to see the fun facts? no just me alright

  48. Kye Kalz on December 19, 2020 at 11:04 pm

    Not wearing pants 😂😂

  49. Youtube Chanel on December 19, 2020 at 11:05 pm

    and = reverse(inputs) nor

  50. Aee Bee Cee on December 19, 2020 at 11:05 pm

    No one wearing pants in the UK

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