Lecture 9: Currents, Resistivity, Ohm's Law

author: Walter H. G. Lewin, Center for Future Civic Media
recorded by: Massachusetts Institute of Technology, MIT
published: Oct. 10, 2008,   recorded: February 2002,   views: 2887
released under terms of: Creative Commons Attribution Non-Commercial Share Alike (CC-BY-NC-SA)
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"When positive charges move in unintelligible directions, then per definition, we say the current goes in this direction. When negative charges go in this direction, we also say the current goes in that direction, that's just our convention. If I apply a potential difference over a conductor, then I'm going to create an electric field in that conductor. And the electrons -- there are free electrons in a conductor -- they can move, but the ions cannot move, because they are frozen into the solid, into the crystal.

And so when a current flows in a conductor, it's always the electrons that are responsible for the current. The electrons fuel the electric fields, and then the electrons try to make the electric field zero, but they can't succeed, because we keep the potential difference over the conductor..."

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Reviews and comments:

Comment1 Shivani Chandra, May 29, 2016 at 7:25 a.m.:

professor walter lewin is one legendary professor.I have never learnt Electromaganetics before with such interest.Thanq so much sir for your awesome video lectures.


Comment2 Shivani Chandra, May 29, 2016 at 7:26 a.m.:

professor walter lewin is one legendary professor.I have never learnt Electromaganetics before with such interest.Thanq so much sir for your awesome lecture videos.

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