Differenciate between electrical resistance and resistivity of a conductor?

Write in the form of a formula a relationship between resistance and resistivity of an ohmic conductor. A wire of length ‘l’ and resistance ‘R’ is stretched so that it’s length is doubled and area of cross section is halved. How will its resistance change?

Dimenstions of electrical resistance is

Write in the form of a formula a relationship between resistance and resistivity of an ohmic conductor. A wire of length ‘l’ and resistance ‘R’ is stretched so that it’s length is doubled and area of cross section is halved. How will its resistivity change . Justify your answer in each case.

What is the difference between resistance and resistor?

Distinguish between resistances and specific resistance.

What are the factors on which the resistance of the conductor depends hence define resistivity of the conductor ?