Connecting wires and components (batteries, resistors, LEDs, etc.) in a loop creates a circuit that allows current to flow. Circuits provide a path for current to flow. To be a circuit, this path must start and end at the same point. Electrical Engineers use schematic diagrams to represent the circuit. 

An electrical circuit is a complete, closed loop that allows electricity to flow, typically from a power source, through conductive components, and back to the source. A basic circuit includes a power source (like a battery or generator), connecting wires, a switch, and a load (like a light bulb or motor). The loop must be unbroken for current to flow; any break, such as opening a switch, creates an open circuit and stops the flow.