ECE106 Lecture 61: ECE 106,University of Waterloo,(p61)
6 Sep 2018
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In a perfect conductor (metal) there is only one type of carrier free electrons ( ine charge). Total charge in the sample of length l, If this amount of charge goes through the cross-section in t sec, then by definition (static case), Note:fraclt = vd is the drift-speed of the electron in a given conducting material in the presence of a given electric field (a potential difference). Typical drift speed is 104 m/s2, while electron"s random motion speed 106 m/s2. Between the surface a and b of the sample, we have v and i (macroscopic). At a point in the sample, we have e and j (microscopic). Resistivity ( ) is the microscopic or the point-form of the resistance. It is a characteristic property of a material. E = e (7. 13) (7. 14) (7. 15) (7. 16) (7. 17) Consider a thin cylinder of length l, and cross-section a.
