## Conductive and insulating materials

Two materials are distinguished: conductors and insulators.

Conductive materials :In conductors, electric charges are free to move and are distributed throughout the material. An electrical conductor therefore carries the electric current (iron, aluminum, salt water, etc.).

Insulating materials (dielectrics) : An electrical insulator is a medium that does not conduct electric current, as it does not allow the passage of free electrons from one atom to another (ebonite, glass, porcelain, plastics, etc.). The insulator becomes charged by friction.