What Is an Electric Circuit? (Definition & Basics)

An electric circuit is fundamentally a closed loop or path that allows electric charge to flow. Imagine it as a continuous roadway exclusively for electrons. For electricity to do work, these charges must have a complete, unbroken route from their starting point, through a device that uses energy, and back to the start. If the path is broken, like a bridge being out on a road, the flow stops entirely – this is an "open circuit."

At its core, every basic circuit requires three main elements. First, an **energy source**, such as a battery or a generator, provides the "push" or potential difference, known as **voltage**. This voltage is the driving force that gets the electrons moving. Second, you need a **conductor**, typically a metal wire like copper, which offers a low-resistance pathway for the electrons to travel along. Finally, there's the **load** – the component that actually utilizes the electrical energy and transforms it into another form, such as a light bulb producing light and heat, or a motor spinning.

As electrons flow through the conductor and the load, this movement constitutes **electric current**. The load, by its nature, opposes this flow to some extent; this opposition is called **resistance**. It's resistance that causes the electrical energy to be converted, making the bulb glow or the motor turn. Thus, a circuit is a dynamic system where voltage drives current through resistance, accomplishing useful work.