lec15 - charged carriers Conductors Semi-conductors...

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Lecture Notes for C-term 2009 Lecture 15 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA ECE 2112 Electromagnetic Theory Copyright, 2000 © R. Ludwig
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ECE2112_15 2 Lecture 15 Objectives • How can conductors, semiconductors, and insulators electrically be classified? • What are the definitions of current and current density? • How is Ohm’s law stated?
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ECE2112_15 3 ECE 2112 - Lecture 15 • Electric Properties of Materials Classification of materials can be done by their conductivity (which is a measure of how well media support electron motion) In semiconductor current density is composed of two
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Unformatted text preview: charged carriers Conductors Semi-conductors Insulators ] / [ 10 7 m S ] / [ 10 3 m S ] / [ 10 15 m S E E u u J J J ) ( h Vh e Ve h Vh e Ve h e ECE2112_15 4 ECE 2112- Lecture 15 Current density and total current Total current is found by integrating over surface E LA R V L A R V Area Current J / / S d I S J ECE2112_15 5 Non-uniform current density Total Current ECE 2112 -Lecture 15 z a I u J ) ( Zero at origin Maximum at outer perimeter...
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This note was uploaded on 10/13/2009 for the course ECE 2112 taught by Professor Ludwig during the Spring '09 term at WPI.

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lec15 - charged carriers Conductors Semi-conductors...

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