Lec 9 | MIT 8.02 Electricity and Magnetism, Spring 2002

Currents
Resistivity
Ohm's Law

Romanian translation courtesy of Mihai Olteanu.

View the complete course at: http://ocw.mit.edu/8-02S02

License: Creative Commons BY-NC-SA
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Education

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• Introduction
• to
• electromagnetism
• and
• electrostatics
• electric
• charge
• Coulomb's
• law
• structure
• of
• matter

[jonahansen]

How about: One atom is talking to another, and says - "Jeez, I lost an electron!". And the other atom says - "Are you sure?" to which the first retorts "I'm positive!".

[Adrianrff]

Not only that, his schemes, equations order and hability to explain are also flawless. Excelent teacher, I wish I had him as a teacher when I took Electromagnetism in collage, it would have made my understanding of it much easier

[ericajjful]

brilliant video

[distractionxx]

some really good stuff here

[zuproc66]

nice... so informative.. if you were my professor in physics here in the Philippines, i would probably be a physics enthusiast and a physics prof like you!.. you are an inspiration to the young generation!

[PROFFESORSEXY]

so thats why those schools are so expensive...but they are the smart kids why do they get the good teacher?

[mdgreg]

What Else is Happening With the Candle?

[TheBochas11]

@jonahansen hahahahahaha nice

[haienkmenk]

THANK YOU!!!!!!!! :)

[LegendLength]

@interstitialofficial

Erm no.  I have learned *tonnes* from these first 9 lectures.

[amrosik]

@amrosik ... the electric field of the potential source, for example a charged sphere, or a simple battery is not simply creating a electric field through the wire... it is only working on the immediate section of the wire, by repelling/atracting the immediate charges.... and as this charges move forward, they create a charge uncalance, thereby repelling the next charges and so on... and this movement would look like a wave which is moving along the wire.

[amrosik]

something you should know in this lecture, is the real imagination of current flow.

take for example a long wire, that is miles long, and swirled up at some points.

now try ti realize how the electric field of an Potential difference, that you apply, will develope through this wire. The current signal would reach the other side of the wire a bit later, so the other side of the wire doenst know yet that you applied a voltage. why is that? the electric field of the potential source...