* Electrons are fundamental particles: All matter is made up of atoms, and atoms contain electrons. These electrons are constantly in motion, orbiting the nucleus.
* Conductors have "free" electrons: In materials that conduct electricity well (like metals), some electrons are not tightly bound to individual atoms. These "free" electrons can easily move throughout the material.
* Voltage creates a "push": A voltage source, like a battery or power outlet, creates an electric field that "pushes" these free electrons in a specific direction. This creates an electric current.
In summary:
The electrons that flow in an electrical circuit are the same electrons that are already present within the conducting material. The voltage source simply provides the energy to make them move in a directed way, creating the current.
