Current and Resistance
... Current density (J) units of ampere/meter2 J=I/A I= nqVdA then J= nqVd This above equation is ONLY VALID if current density is UNIFORM and only if the cross-sectional area A is PERPENDICULAR to the direction of the current ...
... Current density (J) units of ampere/meter2 J=I/A I= nqVdA then J= nqVd This above equation is ONLY VALID if current density is UNIFORM and only if the cross-sectional area A is PERPENDICULAR to the direction of the current ...
chapter19_2007
... Let’s first talk about good electrical conductors Metals are the best examples of good electrical conductors: The electrical resistivity can go from 1.48 µΩ·cm for Ag to 50 µΩ·cm in stainless steels. In pure metals: total = T + r (approx.) Drifting electrons are affected by phonons (elastic wave ...
... Let’s first talk about good electrical conductors Metals are the best examples of good electrical conductors: The electrical resistivity can go from 1.48 µΩ·cm for Ag to 50 µΩ·cm in stainless steels. In pure metals: total = T + r (approx.) Drifting electrons are affected by phonons (elastic wave ...
7_4-5.pdf
... Seebeck coefficients of metals are much smaller than those of semiconductors, and are given by S≈− ...
... Seebeck coefficients of metals are much smaller than those of semiconductors, and are given by S≈− ...
Homework 4
... 0.2 V/m imposed along its entire length. The temperature is the wire is 50 °C. Assume one free electron per atom. (a) Use the information in Table 27.2 and determine the resistivity. (b) What is the current density in the wire? (c) What is the total current in the wire? (d) What is the drift speed o ...
... 0.2 V/m imposed along its entire length. The temperature is the wire is 50 °C. Assume one free electron per atom. (a) Use the information in Table 27.2 and determine the resistivity. (b) What is the current density in the wire? (c) What is the total current in the wire? (d) What is the drift speed o ...
Current and Resistance
... Resistance Ohm’s Law For many materials, the ratio of the current density to the electric field is a constant that is independent of the electric field producing the current I/(volume) = σE Further derivations show that R=L/σA which is called ...
... Resistance Ohm’s Law For many materials, the ratio of the current density to the electric field is a constant that is independent of the electric field producing the current I/(volume) = σE Further derivations show that R=L/σA which is called ...
Chapter 10: Simple Harmonic Motion
... drift speed (~10-4 m/s) The drift speed of electrical conduction can be understood through the Drude model which applies classical mechanics ...
... drift speed (~10-4 m/s) The drift speed of electrical conduction can be understood through the Drude model which applies classical mechanics ...