Some states allow the use of aluminum wire in houses in place of copper.
(a) If you wanted the resistance of your aluminum wire to be the same as that of copper (assuming the same lengths), would the aluminum wire have to have (1) a greater diameter than, (2) a smaller diameter than, or (3) the same diameter as the copper wire?
(b) Calculate the ratio of the thickness of aluminum to that of copper needed to make their resistances equal.