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Question

Define the term resistivity.


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Solution

Resistivity:

  1. A substance's resistivity is defined as the resistance of a wire of that substance with unit length and unit area of cross-section.
  2. Resistivity is the resistance to the flow of current from one end of a material to the other.
  3. The resistivity is denoted as and is proportional to the material resistance and length.
  4. The resistivity of a given material is inversely proportional to its area of cross-section.
  5. Poor conductors have high resistivity. The insulator has a high resistivity.
  6. The formula of resistivity can be given as ρ=RAl Where ρ is the resistivity,R is the resistance, l is the length of the material, A is the area of cross-section.

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