Question

What is the Resistance Rheostat and Resistivity ? difference between them.​

Answer 1

Answer:

Difference Between Resistance & Resistivity

One of the major difference between the resistance and the resistivity of the material is that the resistance opposes the flow of free electrons whereas the resistivity is the property of the material which defines the resistance of the material having specific dimension. The other differences between them are explained below in the comparison chart.

Answer 2

Resistance is the property of a conductor to resist the flow of charges through it .its SI unit is Ohm

Resistivity is the resistance of a conductor of unit metre length and unit square metre of area of cross section. Its SI unit is ohm metre.

rheostat is used to regulate current of a conductor without changing the voltage source.