October 2003
Beginner to intermediate
256 pages
5h 15m
English
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Electrical Attributes
Electrical Current
We can force electrons to move in a conductor (along a copper wire, for instance). We do this by pushing more electrons in at one end and removing them at the other. A source (battery or generator) pushes electrons through a wire and back to the source.
When an electron leaves an atom, it leaves a positively charged hole. We can think of electrical current as holes moving in one direction or electrons moving in the opposite direction. By convention (thanks to Benjamin Franklin), positive current flows from plus to minus.
Figure A.2 shows a current source (like a battery) with a wire connected to a current sink. The current returns to the source by a return path (wire or ground). Conventional current flow ...
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