Here's why:
* Electrons are negatively charged: This means they are attracted to the positive terminal of a battery and repelled by the negative terminal.
* Flow of charge: Electric current is defined as the flow of electric charge. Since electrons are charged particles, their movement constitutes an electric current.
* Conductors: In most circuits, the wires are made of metals. Metals have free electrons that can easily move throughout the material.
Important Note: While electrons are the primary charge carriers in most circuits, there are situations where other particles, like ions, can also contribute to current flow. For example, in electrolytes (like those found in batteries), both positive and negative ions can move to carry the current.
