Books Class Journals Class Mailing List Shop guidelines Intro to Physical Computing Syllabus Physical Computing II Syllabus Basic Electrical Definitions Electricity is the flow of electrons through some conductive material.
Ground is the place in a circuit with where the potential energy of the electrons is zero.
Sometimes this point is connected to the actual ground, either through a grounded electrical circuit, water pipe, or some other method. Basically, any conductor that goes to the earth will do. Current follows the path of least resistance to the ground. So if it has a choice of two paths in a circuit, and one has less resistance, that's the path it'll take. Current is a measure of the magnitude of the flow of electrons in a circuit.