A) Copper contains 8.4 x 10^28 free electrons/m^3. A copper wire of cross-sectional area 7.4 x 10^-7 m^2 carries a current of 1 A. Find the electron drift speed.
B) A student kept her 60-watt, 120-volt study lamp turned on from 2:00 PM until 2:00 AM. How many coulombs of charge went through it?