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# 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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Source: https://blogema.org
Read more all post Computer Technology : https://blogema.org/computer/
1. CrashCourse says

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

2. Danny Figueroa says

Found my second favorite teacher. My first is Jesus.

3. Hawk eye says

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

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

5. OrionTheWildHunt says

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

6. theonlinerover says

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

7. Julian Lopez says

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

8. Angie Hollingworth says

That was brilliant, thank you!

9. Protatodragon1 says

Is that a rip-off intro of ted Ed?

10. Louis says

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.

11. Jeffrey Ogodogun says

Well done Carrie ??????

12. Krishna Savaliya says

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')

13. Matthew Ascough says

this sucks i'm forced to watch it

14. Jameel Mahmood says

Well done ?

15. 1000instruments Girl says

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

16. Drobotics says

I love everyone at crash course!

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.

18. Aee Bee Cee says

No one wearing pants in the UK

19. eddiehimself says

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. reinis z9 says

what?

21. Vinnie P. says

This is one of the hardest things i've tried to learn yet

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

and = reverse(inputs) nor

24. shoyorolldeephalf says

omfg thank you

25. Rubens Alves says

BRO HOW I LOVE LOVE THIS COURSE

she talks way too fast !

27. Samuel Saenz says

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.

28. R Two says

I wish I could kiss you angel

29. Felifluffy says

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

30. Sam Whiffin says

This made me get more confused some how…

31. NIGHTMARE NOOB says

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

32. Josh Greene says

interesting genes

33. D D says

Superb

34. Jay Malguitou says

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

35. Dwaipayan Datta Roy says

??

36. Dwaipayan Datta Roy says

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

37. Harley A.Garcia says

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

38. Mike Tierney says

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

0:50 Journey!

40. Qx378 34 says

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

41. nitin bisht says

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

42. TechStuff says

This was taught incredibly well

43. ByRuss X says

0:50 Journey Criature

44. Vinayagam K says

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

45. Any Caroliny says

Amazing content, love it!!
????

46. Kye Kalz says

Not wearing pants ??