Section4-1TT - Slide Presentations for ECE 329, Slide...

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Unformatted text preview: Slide Presentations for ECE 329, Slide Presentations for ECE 329, Introduction to Electromagnetic Fields Introduction to Electromagnetic Fields 4.1 Conductors and Semiconductors 4.1-3 Material Media can be classified as (1) Conductors and Semiconductors (2) Dielectrics (3) Magnetic materials magnetic property Conductors and Semiconductors Conductors are based upon the property of conduction , the phenomenon of drift of free electrons in the material with an average drift velocity proportional to the applied electric field. electric property 4.1-4 electron cloud nucleus free electrons + bound elecrons In semiconductors, conduction occurs not only by electrons but also by holes vacancies created by detachment of electrons due to breaking of covalent bonds with other atoms. The conduction current density is given by J c = E Ohms Law at a point 4.1-5 = conductivity (S/m) = e N e e h N h e + e N e e conductors semiconductor s = Mobility N h , e = Density of holes ( h ) or electrons ( e ) 4.1-6 V = El J c = E = V l I = J c A = A l V V = I l A V = IR R = l A Ohms Law Ohms Law l A I V E , J c 4.1-74....
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Section4-1TT - Slide Presentations for ECE 329, Slide...

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