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Re: Creating a folder on the desktop
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Re: Creating a folder on the desktop


  • Subject: Re: Creating a folder on the desktop
  • From: "J. Stewart" <email@hidden>
  • Date: Wed, 7 Sep 2005 05:18:13 -0400

On 09/06/05 at -0300 Bill Briggs said this

> No kidding. When they decided the convention for the direction of flow of electric current there was a 50:50
>chance of getting it right. They got it wrong. After they came to understand something of atomic structure and
>figured out that the charge carriers were electrons, they learned that the charge carriers (or current) was going
>in the opposite direction. But after more than 100 years of literature having been written with the other
>convention, it was too late to change it. So we still teach that the current flows from positive to negative,
>when in truth, the movement of charged particles goes in the opposite direction. In some sense, it's not a big
>deal, but it does confuse the hell out of students for a while.

While I was in school for electronics (High School, US Navy, later college courses) I was never taught that "current" flowed in any direction other than negative to positive. I later learned that some engineering courses taught "hole flow" as opposed to "electron flow".

Assuming two neutrally charged atoms, a hole is created when an electron departs a shell of atom 1 for a shell of atom 2 creating one positively charged and one negatively charged ion. In the presence of an applied voltage the holes appear to move in a direction opposite that of the electrons hence "hole flow".

JBS
--
I don't know how I got over the hill without getting to the top. — Will Rogers
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 >Re: Creating a folder on the desktop (From: Bill Briggs <email@hidden>)

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