write a difference between resistance and resistivity of a conductor?
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Resistance is the obstruction offered to the flow of current by a conductor. Resistivity is the obstruction offered to the flow of current by UNIT AREA OF the conductor. So basically, resistance is the property of the object (say a copper wire), whereas resistivity is the property of the substance (copper).
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The resistance is the ratio of the length and cross-section area of the conductor, whereas the resistivity of the material is the ratio of the product of the resistance and area to the length of the conductor. ... The SI unit of the resistance is ohm, and the SI unit of resistivity is ohm-meter.
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