A certain wire has a length L and a resistance R. It is stretched uniformly to a length of 2L. The resistance of the wire after it has been stretched is When a current ows in an aluminum wire of diameter 3.15 mm, the drift speed of the conduction electrons is 0.000101 m/s. How many electrons are owing past a given point each second? The conduction electron density in aluminum is 6.00 X 1028 m'3. You measure the current through a 21.9 $2 resistor to be 619 mA. What is the potential difference across the contacts of the resistor