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Standard VII
Chemistry
Resistance and Resistivity
Define the te...
Question
Define the term resistivity.
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Solution
Resistivity:
A substance's resistivity is defined as the resistance of a wire of that substance with unit length and unit area of cross-section.
Resistivity is the resistance to the flow of current from one end of a material to the other.
The resistivity is denoted as and is proportional to the material resistance and length.
The resistivity of a given material is inversely proportional to its area of cross-section.
Poor conductors have high resistivity. The insulator has a high resistivity.
The formula of resistivity can be given as
ρ
=
R
A
l
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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