Question

what is resistance N resistivity?

Answer 1

Resistance is the property to resist. Resistance is measured in ohms. Good conductors, such as copper, have low resistance . Good insulators, such as rubber,has a high resitanc-  e. Resistance causes electrical energy to be dissipated as heat.Another definition is...
The ratio of the voltage applied to the electric current which flows through it. If the resistance  is constant over a considerable range of voltage, then Ohm's law, I = V/R, can be used to predict the behavior of the material.

Resistivity:-
Electrical resistivity is a fundamental property of a material that quantifies how strongly that material opposes the flow of electric current. A low resistivity indicates a material that readily allows the flow of electric current. Resistivity is commonly represented by the Greek letter ρ. Its unit ohm metre.

Answer 2

Explanation:

Resistance is the opposition that a substance offers to the flow of electric current.

The electrical resistivity of a specimen of a material may also be known as its specific electrical resistance. It is a measure of how strongly a material opposes the flow of electric current.