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The resistance (R) of a conductor is given by the formula R = ρL/A, where ρ is the resistivity of the material, L is the length, and A is the cross-sectional area. Resistivity (ρ) generally increases with temperature. To minimize resistance, you need a material with low resistivity (which copper provides), shortest length (L), largest cross-sectional area (thickest wire), and lowest temperature (coolest). Therefore, a thick, short, and cool conductor will have the least resistance.