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siylence
Oct27-10, 11:15 AM
I'm trying to learn superposition but I'm confused with this part of the video at around 3:50:
http://www.youtube.com/watch?v=nisdYIkIYXo&NR=1

The guy makes the current go clockwise from positive to negative in the loop, but I think that's a mistake... Am I wrong to think the current should be going counter-clockwise?

dlgoff
Oct27-10, 11:42 AM
Current is defined as the rate at which positive charge is transferred. So electrons will move in the opposite direction since they have a negative charge.

Edit: I hope this was your question since I didn't view the video.

siylence
Oct27-10, 04:17 PM
The current is going from the positive node to the negative node in the video according to his drawing. Am I wrong to think this should be the other way around?

dlgoff
Oct27-10, 05:11 PM
Although it is electrons which are the mobile charge carriers which are responsible for electric current in conductors such as wires, it has long been the convention to take the direction of electric current as if it were the positive charges which are moving.

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elecur.html