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October, 2024

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Electrical Engineering majors or professionals I need your help...

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kingsskier
Posts: 6212 - Karma: 2,100
I can not find this in my book or online. I am working on electron diffusion current densities and I can not figure out if my book example is incorrect or if I am not understanding the formula.
So I know Jndiff = -qDn(-dn/dx)
I know how to find Dn using Einstein's relation using electron mobility and thermal voltage.
The q is the charge in C correct? Is it just a value of 1? If you find it using Einstein's relation I always get something like 1.01. Am I incorrect?
Is the last part the concentration gradient?
Do I have to convert anything because I know the answer is supposed to be in A/cm^2 and I get A/cm*um
If you help explain all this jiberish I would greatly greatly appreciate it.
Sep 10 2010 12:06PM
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An10a_Eng
Posts: 2505 - Karma: 26
we just started talking about this wednesday in lecture...i took a nap though. maybe well cover it in my lecture today, well see
Sep 10 2010 12:13PM
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An10a_Eng
Posts: 2505 - Karma: 26
q is the charge of an electron in C..i know that much
Sep 10 2010 12:16PM
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kingsskier
Posts: 6212 - Karma: 2,100
We covered it last week and my prof is a 90 year old mumbling foreigner. I couldnt understand him if I tried. He had to ask us if Internet Explorer was a web browser an he is an EE prof. This is why I don't know this haha
Sep 10 2010 12:17PM
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kingsskier
Posts: 6212 - Karma: 2,100
Is it always just 1. Basically denoting a + or - value for holes and electrons?
Sep 10 2010 12:18PM
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An10a_Eng
Posts: 2505 - Karma: 26
haha that sucks. my professor is pretty bad too..ill try to pay attention today and see whats up
Sep 10 2010 12:19PM
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An10a_Eng
Posts: 2505 - Karma: 26
i am not sure
Sep 10 2010 12:21PM
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