Define – resistance and resistivity. State relationship between them. Give one material having high resistivity.
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Ans: Resistance and Resistivity: Resistance: It is the opposition offered by the conductor to the flow of current. Resistivity: It is property of the substance by virtue of which it opposes to the flow of current passing through it. The resistance of a specimen piece of material having unit length and unit cross sectional area is known as resistivity of that material. 

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Specific resistance or resistivity is defined as the resistance between the opposite faces of a meter cube of the material. Relationship between Resistance and Resistivity: Resistance = R = ρ ( l / a) Ω where, ρ = Resistivity of material in Ω-m. l = length of conductor in m. a = cross sectional area of conductor in m2 . Material having high resistivity: Mica, Nichrom, Rubber, Glass, Plastic Porcelain, Dry wood, Insulating material etc.
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