Consider dropping a ball from rest. This ball moves from astate of high gravitational potential energy to one of lowgravitational potential energy as it falls to the ground. Similarly, charges move from a state of high electric potentialenergy to one of low electric potential energy.

Mustang Sally just finished restoring her1965 Ford Mustang car. To save money, she did not get a newbattery. When she tries to start the car, she discovers that thebattery is dead and she needs a jump start. While unhooking thejumper cables, the positive and negative cables almost touch and aspark jumps between the ends of the cables. This spark is caused bythe movement of electrons through the air between the batteryterminals. In what direction are the electrons traveling?