Question

define resistance and resistivity and also give the relationship between them
Explain the dependence of resistance on temperature

Answer 1

Answer:

The SI unit is ohm. Resistivity: It is the resistance provided by a conductor of unit length and area of 1 sq. If temperature is increased, resistance also increases and vice versa.

The measure of a material's ability to oppose the flow of electric current through it is called resistance and it is denoted by R

.Relation between them:-

The resistance of a cylindrical segment of a conductor is equal to the resistivity of the material times the length divided by the area: R≡VI=ρLA. The unit of resistance is the ohm, Ω. For a given voltage, the higher the resistance, the lower the current.

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