Q24 of 330 Page 27

State the SI unit of resistivity.

Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohm-metre (Ω⋅m).


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23

Calculate the area of cross section of a wire if its length is 1.0 m, its resistance is 23Ω and the resistivity of the material of the wire is 1.84 x 10-6 Ωm.

 24

Define resistivity. Write an expression for the resistivity of a substance. Give the meaning of each symbol which occurs in it.

 24

Distinguish between resistance and resistivity.

 24

Name two factors on which the resistivity of a substance depends and two factors on which it does not depend.