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September 07, 2010
University Physics, Chapter 25
19
Current
!
Current is a scalar
!
Current has a sign but not a direction
!
(Note:
current density
is a vector! - see later)
!
We will represent the direction of the current flowing in a
conductor using an arrow
!
This arrow represents whether the net current is positive or
negative in a conductor at a given point but does not represent
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Unformatted text preview: a direction in three dimensions ! Physically, the charge carriers in a conductor are electrons that are negatively charged ! However, as is conventionally done, we define positive current as the net flow of positive charge carriers past a given point per unit time Thursday, September 23, 2010...
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- Fall '08
- Wei
- Current, Electric charge, charge carriers, positive charge carriers
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