Two cylindrical bars, each with diameter of 2.40 cm, are welded together end-to-end. One of the original bars is copper and is 0.370 m long. The other bar is aluminum and is 0.195 m long. What is the resistance between the ends of the welded bar at 20 oC ?
Resistance of a wire in Ω R ρL/A ρ is resistivity of the material in Ω-m L is length in meters A is cross-sectional area in m? A πr?, r is radius of wire in m resistivity Cu 17.2e-9 Ω-m resistivity Al 28.2e-9 Ω-m Calculate the resistance of each section and add them (assuming they are in series, end to end is a bit vague) .
