MATS 3011 Lecture Notes - Formula One
Document Summary
Electronic properties and how they relate to structure. Metal conduction example metal apply some voltage (potential bias?) Force on a charge, q: f = qe. For an electron, q = -e ----------> f = -ee. Electron moves in the opposite direction of the electric field. R = resistance (ohms, omega) let"s say we have cylindrical metal. Resistivity = material property; independent of sample dimension (shape/size of sample) (doesn"t say this in book) has units of ohms*cm (omega*cm) Even though a and l are in the formula, those are accounted for in r term as well, that"s why resistivity is independent of sample dimensions example: filaments = thin wires, coiled. Matsci page 2 from ohm"s law, v = ir. Matsci page 3 sigma = conductivity of material (units = 1/resistivity) Conductivity = measure of how easily current can flow/charge can be transported from one place to another. Such a vast difference (compared to other physical properties)
