Conducting materials are classified in to three major categories based on the conductivity. The super conductors like alloys of aluminium, zinc, gallium, niobium, etc. These materials conduct electricity almost with zero resistance blow transition temperature. Thus, they are called zero resistive materials.

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These materials are used for saving energy in the power systems, super conducting magnets, memory storage elements etc. The metals like silver, aluminium and alloys have high electrical conductivity. These materials are called low resistive materials.

They are used as conductors, electrical conduct etc. The materials like tungsten, platinum, nichrome etc. These materials are called high resistive materials. Such a metals and alloys are used in the manufacturing of resistors, heating elements, resistance thermometers.

The conducting properties of solid do not depend on the total number of the electrons available because only the valance electrons of the atoms take part in the conduction. When these valance electrons detached from the orbit they are called free electrons or conduction electrons. In a metal, the number of free electrons available is proportional to its electrical conductivity. Hence, electronic structure of a metal determines its electrical conductivity. We know that the electrons in the outermost orbit of the atom determine the electrical properties in the solid.

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The free electron theory of solids explains the structure and properties of solids through their electronic structure. This theory is applicable to all solids, both metals and non metals. It explains. It is a macroscopic theory, proposed by Drude and Lorentz in According to this theory, the free electrons are mainly responsible for electrical conduction in metals.

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This theory obeys laws of classical mechanics. It is a microscopic theory, proposed by sommerfeld in According to this theory, the electrons in a metals move in a constant potential. This theory obeys laws of quantum mechanics.

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Bloch proposed this theory in the year According to this theory, the free electrons move in a periodic potential. This theory explains electrical conductivity based on the energy bands. Related Links. PH Engineering Physics 2 Notes free download.After you enable Flash, refresh this page and the presentation should play. Get the plugin now. Toggle navigation.

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