Circuit
From Electronics Wiki
A circuit is a feature of every electronics assembly. It consists of a voltage source and a load, and the wires that connect them. the voltage source is responsible for charge separation, and the load does useful work. There are at least two pathways for charges to flow, usually labelled positive and negative. The entire circuit makes a conductive loop.
Following is a schematic of an AC circuit, modeled with the tool LTspice.
