Charge, Induction, Conducters vs Insulators
Elementary charge Elementary charge as a unit In some natural unit systems, such as the system of atomic units, e functions as the unit of electric charge, that is e is equal to 1 e in those unit systems. The use of elementary charge as a unit was promoted by George Johnstone Stoney in 1874 for the first system of natural units, called Stoney units. Later, he proposed the name electron for this unit.
In a conductor, electric current can flow freely, in an insulator it cannot. Conductors and Insulators
Charges and Fields 2.04
Electromagnetic induction is the production of a potential difference (voltage) across a conductor when it is exposed to a varying magnetic field.