Here's why:
* Electrical current is the flow of electric charge.
* Electrons carry a negative charge.
* In most conductors (like metals), electrons are loosely bound to their atoms and can move freely. When a voltage is applied, these electrons flow in a specific direction, creating an electrical current.
While protons also carry charge, they are tightly bound within the nucleus of an atom and don't move freely like electrons, so they don't contribute to electrical current in most materials.
