Lec 32 | MIT 8.02 Electricity and Magnetism, Spring 2002

1. 

   alanot says:

   April 30, 2012 at 9:54 PM

   In an Electric Circuits course you see that it is important to set the power supply in terms of cosine, to simplify the circuit when working with several series/parallel impedances.

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2. 

   DonQuichotteLiberia says:

   April 30, 2012 at 9:17 PM

   it doesn’t matter if you take a sine or cosine, just adjust phi accordingly

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3. 

   alanot says:

   April 30, 2012 at 8:29 PM

   of course… that’s the way for you to change between sines and cosines….

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4. 

   cabbotron says:

   April 30, 2012 at 8:19 PM

   at 20:02 he draws a straight line by moving his chalk so fast…it actually makes a dotted line. Is there a special technique used to do this? Or does his medication cause a cosine frequency of seizures in his wrist of which he has perfect control? :o)

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5. 

   cabbotron says:

   April 30, 2012 at 8:19 PM

   22:23 “You’re an idiot!!!” if you choose any other coordinate system than the ‘right-hand’ XYZ. Well said…hahahhahaa

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6. 

   cabbotron says:

   April 30, 2012 at 8:11 PM

   I’d like to see some proof that the poynting vector “oscillates like mad.” (24:17).

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7. 

   cabbotron says:

   April 30, 2012 at 7:31 PM

   38:15 watch out for molten copper falling on your hands, Professor “I don’t wanna melt my hand no more”

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8. 

   picobyte says:

   April 30, 2012 at 6:42 PM

   Lollz the dutch accent is funny 🙂

   Reply
9. 

   webphy6 says:

   April 30, 2012 at 6:02 PM

   One of my dreams is to go to a nice university in the US; seeing this video, in a way, fuels that dream 😉 thanks for the post!

   Reply
10. 

    webphy6 says:

    April 30, 2012 at 5:04 PM

    …when i say “go to” I mean really become a part of – as a student 😉 hehehe

    Reply
11. 

    scientificboysclub says:

    April 30, 2012 at 4:52 PM

    ME TOO

    Reply
12. 

    navyseal100 says:

    April 30, 2012 at 4:44 PM

    me 2

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13. 

    PolskaUrban says:

    April 30, 2012 at 4:00 PM

    thats harvard MIT right?

    Reply
14. 

    theone320 says:

    April 30, 2012 at 3:21 PM

    There is a special technique to the dotted line.

    Reply
15. 

    affluenceclm says:

    April 30, 2012 at 2:48 PM

    Free Energy is real and its here! The Oil companies are doing everything they can to stop this

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    Reply
16. 

    BetterRedThanDead says:

    April 30, 2012 at 2:35 PM

    at 7:05 (ish) did he really just say that there is nothing special about cosine… IN LIFE? it sounds like that every time i hear it. to that i reply lol. and i sincerely mean lol.

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17. 

    MRburitz says:

    April 30, 2012 at 2:23 PM

    2 people failed this class

    Reply
18. 

    ducaticlaudia says:

    April 30, 2012 at 2:21 PM

    there is nothing special about a cos(x) in life
    LOOL

    Reply
19. 

    rukus100821 says:

    April 30, 2012 at 1:54 PM

    completely different. research it to get your answer.

    Reply
20. 

    EJNewbury says:

    April 30, 2012 at 1:34 PM

    One thing that does annoy me about all these videos is that in -every- one, someone asks about the chalk line. This guy is explaining some really cool shit, and we notice his writting utensil more then anything else….

    Mr. Lewin, please, for the love of god, post a video about the damn chalk line so people will stop asking, lol. I’m begging you. Or maybe, crazy thought, people could just buy some damn chalk and try it out on a sidewalk till they get it, you knkow, cause it’s so importent.

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21. 

    KClaisse2 says:

    April 30, 2012 at 1:08 PM

    @cabbotron you just hold the chalk loosely in your hand at an angle and let it bounce as it moves over the surface of the chalk board.

    Say the chalk board is this line and the chalk is represented by the slashes. You are going to move the chalk to the right while holding it at the same angle (maybe even rotated a bit more counter-clockwise) in the illustration below:

    –> ____\____ –>

    I always see this asked on all these videos so I hope this explains it well.

    Reply
22. 

    illinois008 says:

    April 30, 2012 at 1:07 PM

    electricity is important, else there will be no internet connection.

    Reply

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