Question

what s resistance how it is rekated to resistivity

Answer 1

The resistance of an object (i.e., a resistor ) depends on its shape and the material of which it is composed.Resistivity ρ is an intrinsic property of a material and directly proportional to the total resistance R, an extrinsic quantity that depends on the length and cross-sectional area of a resistor.

Answer 2

Resistance

It is the property of a conductor to resist the flow of charges through it. Its S.I unit is ohm (Ω).

R = V/I

Where,

• R = Resistance
• V = voltage
• I = current.

Factors on which the resistance of a conductor depends:

• Resistance depends on its length (L)
• Resistance depends on its cross sectional area (A)
• Resistance depends on the nature of material

$\sf{R\propto \dfrac{L}{A}}$

$\sf{R=\rho \dfrac{L}{A}}$

• Where "ρ" (rho) is proportionally constant known as resistivity of the material of conductor.

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Resistivity

• It is the property of the conductor due to which it offers resistance to the flow of current through it .
• It is measured by the resistance offered by 1m length of wire of that material of area of cross section 1 m2.
• Resistivity of the material depends only on its material and temperature.