ECurrentsR34

# ECurrentsR34 - 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? Electrons move towards the rod but they don’t all move to one side because they repel each other. Eventually the charges stop moving when the net electric field in the can is zero. (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? a battery ) to the region of high potential only to fall again. (We call this an Electrical Circuit ). 1

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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
What particles carry charge in a current? 1. In a conductor (like a copper wire): What carries the charge? Electrons. Is the charge being carried (+) or (-)? Negative (-) . 2. Salt Water (With a voltage supplied across two points): What carries the charge? Na + and Cl - ions. Is the charge being carried (+) or (-)? Both charges are present. 2

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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.
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