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Unread 12-01-2002, 19:13
s_alaniz s_alaniz is offline
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current flow.

Joseph F


Well ok you win... sort of... Benjamin Franklin defined what we call "conventional" current flow as going from positive to negative however, we now know that electrons flow from negative to positive. Current flow is formally defined as the flow of ELECTRONS through a material OR the flow of CHARGES through a material. SO technically current flow can be considered in either direction as long as you're consistant. My argument against "Conventional" is the fact that an AMP is defined as a coulomb of ELECTRONS past a given point, hence my assurtion that current flow is actually negative to positive and "conventional" flow is a simply a result of the electron flow. On the other hand, you can't have electron flow without the accompanying hole "movement"... it becomes the "Chicken and egg" arguement. You can't have electrons move unless there's a hole to move to, but you can't have a hole move unless the electrons move...
And as for the question of which you connect first... NO... you connect the positive LAST and disconnect it FIRST (rule of thumb for electronic circuits). The reason is because a lot of electronic components have a chasis ground which was pretty standard for a long time and still shows up a lot. Disconnecting the positive side doesn't always guarantee you a dead circuit.
If you're only talking about a known isolated chasis system (like we have in FIRST) and you're disconnecting the battery feed... it doesn't matter which you connect or disconnect first.... The chicken OR the egg... (Did I get that right?)


Best Wishes


Steve Alaniz



"You're saying we can look forward to robots behaving badly and demamding higher salaries." - Sally Forth
 


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