Linker IT Software
Google
Web www.oraxcel.com
menubar-top-links menubar-top-rechts
Home Help Search Login
Welcome, Guest. Please Login.
SQL*XL: Database to Excel bridge litLIB: Excel power functions pack ExcelLock: Locking and securing your valuable Excel spreadsheets encOffice: Protect your Excel file easy and safe encOffice: Protect your Excel file easy and safe
Pages: 1
Drude model (Read 3020 times)
Gerrit-Jan Linker
YaBB Administrator
*****




Posts: 75
Drude model
17.09.09 at 09:04:50
 
Drude model
 
The Drude model of electrical conduction was proposed to explain the transport properties of electrons in materials (especially metals).  
 
The model is an application of kinetic theory.
 
The model assumes that the microscopic behavior of electrons in a solid may be treated classically. In the model the solid is thought of as a sea of electrons bouncing off heavier, relatively immobile positive ions.
 
The atoms condensed into a solid give up their loosely bound valence electrons, which are free to wander through the metal and lead to conduction of charge and energy/heat.
 
The two most significant results of the Drude model are an electronic equation of motion and a linear relationship between current density J and electric field E.
 
The amount of current j produced by an electric field E applied to a metallic sample can then be shown to be related to the number of carriers (carrier density n) and the ease with which theese carriers are accelerated (τ (tau), the time between collisions that randomise the electron flow)  
 
j=σE
where
j = current
σ = conductivity = 1/ρ = the inverse of the resistivity
E = electric field
 
Source:
Wikipedia - Drude model
http://en.wikipedia.org/wiki/Drude_model
Drude and Sommerfeld theory of metals
http://tau.nanophys.kth.se/cmp/hall/node1.html
Back to top
 
« Last Edit: 29.11.09 at 22:16:48 by Gerrit-Jan Linker »  

Gerrit-Jan Linker
Linker IT Software
Email WWW Gerrit-Jan Linker   IP Logged
Pages: 1