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Resistance and Resistivity Directions: TYPE ALL of YOUR ANSWERS IN A DIFFERENT COLOR (not black!) Go to this link: Objectives: 1. To study the relationship between the resistance of a wire and its dimensions 2. To know the effect of the type of material on its resistance. 3. To distinguish between resistance and resistivity 4. To find the resistivity of a given wire and from this determine the material Apparatus: Theory: Resistivity (ρ) is a fundamental material property, while the resistance (R) of an electrical conducting wire depends on several factors, such as: type of conductor material, length of the conductor, cross-sectional area, and the temperature of the wire. At a constant temperature, the resistance R of a given conductor is directly proportional to its length L and inversely proportional to its cross-sectional area A. This resistance is given by the following formula: Where: ρ: is the resistivity of the wire material measured by (Ω.m)