Published On Apr 5, 2020
Explain Drude Model for electric conduction in Metals by Free Electrons
The metal consists of atoms. These atoms loss their valence electrons and becomes a positive charged ions.
The positive ions are fixed in lattice. The free electrons move throughout the body of the metal but are confined within the metal. The electrons behave like molecules of a perfect gas in a container.
The Drude model neglects any long-range interaction between the electron and the ions. The electrons move in random directions and collide with each other and positive ions. All the collisions are elastic and hence there is no loss of energy. The average time between subsequent collisions of such an electron is τ.
After a collision event, the velocity (and direction) of the electron depends only on the local temperature distribution and independent of the velocity of the electron before the collision event.
The movements of free electrons obey the law of the classical kinetic theory of gases theory of gases. It obeys the classical the Maxwell-Boltzmann distribution of kinetic energies, with an average thermal energy
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