What is resistivity? How does it depends on the length of a conductor? Discuss the significance of the materials having high resistivity value.
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Answer:
Resistivity of materials is the resistance to the flow of an electric current with some materials resisting the current flow more than others
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(1) What is resistivity?
»» Resistivity, electrical resistance of a conductor of unit cross-sectional area and unit length. ... A characteristic property of each material, resistivity is useful in comparing various materials on the basis of their ability to conduct electric currents. High resistivity designates poor conductors.
(2) How does it depends on the length of a conductor?
»» Length: Resistance is directly proportional to the length of the conductor. So as the length increases the value of resistance increases. Cross-sectional area: Resistance is inversely proportional to the cross-sectional area of the conductor.
(2)Discuss the significance of the materials having high resistivity value.
»» Materials having high resistivity or low conductivity are very useful for some electrical engineering products and applications. These material are used to manufacture the filaments for incandescent lamp, heating elements for electric heaters and furnaces, space heaters and electric irons etc.