1.

Give two points of difference between resistance and resistivity.

Answer»
ResistanceResistivity
1. It is the property of a conductor to resist the flow of charges through it.It is the resistance per unit length of a a unit cross section of the material.
2. Its unit is ohm (Ω).Its unit is ohm metre (Ωm).

3. Resistance depends on length, cross­sectional area of the wire, and material medium that depends on its temperature.
R α  \(\frac { L }{ A }\)(RαT)

Resistivity is the constant value for a conductor only at a given temperature. It varies with temperature. P α T.
Resistivity increases with rise in temperature of metals and alloys.


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