DC can be stored electrochemically in a battery. Electron A negatively charged particle which orbits the positively charged nucleus of an atom. The movement of electrons through a conductor. In conductors, such as gold, copper, and aluminum electrons can be easily forced to break orbit and flow to a new orbit around at a neighboring atom. Each electron leaving an atom is replaced by another in a musical chairs like dance.
Electrons can only flow in a closed circuit.
The electromotive force which will cause current to flow. A voltmeter measures the difference in potential between two points. It may be helpful to think of voltage to electricity flow as pressure is to water flow. Named after Allesandro Volta the Italian physicist who by 1800 was making the first batteries. A count of how many electrons pass a given point in one second.