The classical free electron theory, Electrical Engineering

The free electron theory of metals was first proposed by Drude and later improved by Lorentz. The main postulates of this theory are

1.       All metal contain, adequate number of valence electron forming an electron gas which is free to move throughout the volume of the metal. A metal can be regarded as an array of positive ions permeated by a gas of free electrons.

2.  The electron velocities in metals obey the classical Maxwell-Boltzmann distribution of velocities.

3.  In the absence of an electric field the electrons move in random directions, making collisions from time to time with positive ions. Which are fixed in lattice.

4.  The free electrons in the electron gas wander freely in the metal without any mutual interation. 6.  When an electric field is applied to the free electrons are accelerated. They move in opposite direction to the electric field while maintaining their random motion.

 

Posted Date: 7/2/2012 10:02:00 PM | Location : United States







Related Discussions:- The classical free electron theory, Assignment Help, Ask Question on The classical free electron theory, Get Answer, Expert's Help, The classical free electron theory Discussions

Write discussion on The classical free electron theory
Your posts are moderated
Related Questions
Q. Explain the working principle of an opto coupler? When it is necessary to block the voltage between one electronic circuit and another, and transfer the signal at the same t

Q. What is the requirement of a hybrid in telephone networks? How does it work? Ans: Digital exchanges require receive and transmit signals on separate two-wire circuits. Th

Switched Mode Power Supply  (SMPS) Switching mode power  supply converts an unregulated DC voltage  to a regulated DC  output  voltage . SMPS  stands  for switched mode  power

Condition Return Similar to conditional jump and call  instructions there are conditional return  instructions  also  based on various  flags.

Figure shows the cross-section of an electrostatic problem with translational symmetry: a rectangular coaxial cable. The inner conductor is held at 10 volts and the outer conductor

A capacitor is charged to 100 V and then discharged by a 50 kΩ resistor. If the time constant of the circuit is 0.8 s, verify: (a)  The value of the capacitor, (b)  The time

Q. Explain digital Storage Oscilloscope (DSO) with neat diagram, (b) Give the difference between analog and digital storage oscilloscope.   Principle of operation : The availa

#The requirement is as follows- There is a signal which is in the range of 0 to 5Hz. This signal frequency composition is to determined. The resolution of the determination is 1Hz.

Find Dispersion Relation for Free Electron Question: Find the dispersion relation for a free electron, and, thus, observe the relation between its rest mass and effective ma

Q. Based on the 8421 BCD code for decimal digits 0 through 9, develop a block diagram for a BCD encoder and its implementation scheme.