Here's why:
* Electrons are negatively charged: This charge is what allows them to be easily moved by an electric field.
* Metals have free electrons: Metals are good conductors because they have electrons that are loosely bound to their atoms and can move freely throughout the material.
* Electric current is the flow of charge: When a voltage is applied across a wire, it creates an electric field that pushes the free electrons in a specific direction, resulting in the flow of electric current.
So, while other particles exist within a wire, like protons and neutrons in the atoms of the metal, it's the movement of electrons that constitutes electric current.
