Question

What do you mean by resistivity of a substance? On factor does it depends?​

Answer 1

Answer:

Resistivity definition:

The resistivity of a substance is the resistance of a cube of that substance having edges of unit length, with the understanding that the current flows normal to opposite faces and is distributed uniformly over them. ... The SI unit of electrical resistivity is the ohm⋅metre (Ω⋅m).

Answer 2

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The resistance of a conductor depends on the following factors:

Length: The resistance of a conductor depends on the length of the conductor. Actually, the resistance of a conductor is directly proportional to the length of the conductor.

Area: The resistance of a conductor depends on the area of cross-section of the conductor. Actually, the resistance of a conductor is inversely proportional to the area of cross-section of the conductor.

Material: The resistance of a conductor depends on the nature of material of the conductor. Resistance of a conductor is very less for those of aluminium and copper wires while resistance of a conductor is maximum for rubber wires.

Temperature: The resistance of a conductor depends on the temperature of the conductor. Now, the nature of change of resistance depends on the material of the conductor. For metal and alloys, the resistance of a conductor increases on increasing the temperature of the conductor. But in case of semiconductors like silicon and germanium used in electronic circuits, the resistance of these materials decreases on increasing the temperature of the conductor.

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