electron movement?
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Posts: 46,084
This talk of Vdd=Vcc has confused me with respect to electron flow. Don't
electrons move from the negative terminal to the positive terminal? what is
"hole migration". Thanks.
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electrons move from the negative terminal to the positive terminal? what is
"hole migration". Thanks.
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
Hole migration - imagine electrons flowing from negative to positive. As
each electron moves forward it leaves a space - or a hole - which is quickly
filled by another electron. If the electrons are moving from left to right,
then the "hole" would appear to move from right to left. It is also referred
to as "hole current", which of course would flow from positive to negative
Sid
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Semiconductors of the 'p' type (as in npn or pnp transistors) have
predominantly POSITIVE charge carriers (called 'holes' for lack of a
more sophisticated name.)
Some metals ALSO have predominately positive charge carriers.
Usually it doesn't matter what's moving. We USUALLY can't tell the
difference but magnetic fields show the difference clearly. See a
search of the 'Hall Effect'.
At 6:56 PM -0400 on 6/3/02, sean975@a... wrote
>This talk of Vdd=Vcc has confused me with respect to electron flow. Don't
>electrons move from the negative terminal to the positive terminal? what is
>"hole migration". Thanks.
>
--
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Chuck Britton Education is what is left when
britton@n... you have forgotten everything
North Carolina School of Science & Math you learned in school.
(919) 416-2762 Albert Einstein, 1936
Don't get confused! For all practical purposes electrons are the only things
that move. Holes are what happens when an atom looses an electron. If for
instance you have 4 atoms of silicon wich are covalently bonded (share
electrons) to each other and one happens to loose an electron you will see that
an electron from one of the other si's will replace that one lost causing a
chain reaction. This is called hole migration. Don't think of it as a moving
proton or anything because that is wrong just think of it as a moving
defficiency of an electron or electrons.
good luck!
Randy Knutson
sean975@a... wrote: This talk of Vdd=Vcc has confused me with respect to
electron flow. Don't
electrons move from the negative terminal to the positive terminal? what is
"hole migration". Thanks.
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Think of it this way, if you're (you being the electron) standing on a
rail road platform, waiting to get on a train. When you get on the train
and the train starts travelling east (electron flow). You could say,
that that the platform (the place where you were standing) is travelling
west, relative to your new position on the moving train("hole
migration"). It's just a change in relativity, or point of observation.
We have (as often quoted on the footer of one email sender) Albert
Einstein to thank for this relative theory. But Electrons are the main
"movers and shakers" (literally) in physics.
So to recap:-
Conventional current flow and "hole migration" is from POSITIVE to
NEGATIVE.
Electrons flow from NEGATIVE to POSITIVE.
Rob
Original Message
From: sean975@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=GX2AIQtZVOMAjdMLrbX5j0uwlOkDncFKJM0LJrISG5vm4gN9dgUatnUj0JoPCcTj6EGthv8VPriv]sean975@a...[/url
Sent: 03 June 2002 23:57
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] electron movement?
This talk of Vdd=Vcc has confused me with respect to electron flow.
Don't
electrons move from the negative terminal to the positive terminal? what
is
"hole migration". Thanks.
[noparse][[/noparse]Non-text portions of this message have been removed]
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject
and Body of the message will be ignored.
Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/