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chp34ECurrents

# chp34ECurrents - Electric Current When charges ow between...

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Electric Current When charges flow between regions of different potential, we have a current . Some examples: Put a (+) rod near an Aluminum can. What happens? (We call this a Transient Current ). System in which charged material ”falls” from a region of high potential to one of low potential and is then ”pumped” back up ( with what? ) to the region of high potential only to fall again. (We call this an Electrical Circuit ). Current is measured in number of coulombs passing a point per second: 1 ampere (or ”amp”) = 1 coulomb/second or 1 A = 1 C/s 1

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What particles carry charge in a current? 1. In a conductor (like a copper wire): What carries the charge? Is the charge being carried (+) or (-)? 2. Salt Water (With a voltage supplied across two points): What carries the charge? Is the charge being carried (+) or (-)? 2
Direction of A Current Suppose I have a large (+) charge causing an Electric Field: A (-) charge will fall towards it, lowering its P.E. and increasing its K.E. A (+) charge will fall away from it, (again) lowering its P.E. and increasing its K.E.

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