Electrical engineering majors? Please help me solve these problems. 1) A current of 1400 A exits in a rectangular (0.6 * 9 cm) copper bus bar. The current is due to free electrons moving through the bus bar at an average velocity of v m/s. If the concentration of free electrons is 10^29 electrons/m^3 and if they are uniformly dispersed throughout the bus bar, then what is the average velocity of an electron? 2)How much energy is extracted from an electron as it flows through a 9V battery from the positive to the negative terminal? I know these questions gotta be easy, because they are on the first chapter of my book.