This will be my last electricity topic for a while. 1. If an electron is "ejected" by the anode of the battery with voltage, in which form of energy has the electron gained? Kinetic Energy or Potential Energy? If it's Potential Energy, how could you physically describe it? I can tell a fast moving electron has a lot of Kinetic Energy because It's moving fast. But how can I describe the Potential Energy of an electron? 2. In circuits, how is voltage related to the electric field? Why must work be done against the electric field? Does the battery have an electric field? If so, what is the direction of it? Is it from negative to positive or vice versa? 3. How come only moving charge produces a magnetic field?