Posted by Texasmark1 on March 11, 2012 at 15:11:51 from (67.142.175.26):
In Reply to: Re: Diode direction? posted by George Marsh on March 11, 2012 at 11:12:12:
"Some think the flow is reversed. And in a way, if you go with current flow theory, current flows with the arrow, electrons flow against the arrow. Hope this helps."
George my man you did good till you added this sentence. There is electron movement and there is the "absence of electrons referred to has holes".
Electrons being negative charges are attracted by a positive voltage. Hence if you want the diode to conduct electric current (electrons) you forward bias the diode with the most positive voltage on the Anode...the right side of the picture.
If you are a college boy you are taught "hole flow" which is just the opposite of electron flow for direction and polarity. The hole is merely the "hole" developed when the electron moves down the line. The electron goes to the + terminal and the holes migrate in the opposite direction to the negative terminal.
Having been to both schools, I found that if you are fixing something that has already been designed then electron theory is the way to go about it.
However, if you are an electronics equipment designer, hole theory is more convenient as it works from the power source out to the load whereas with the electron theory, electrons are sucked back to the power source and you approach it from the opposite direction.
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