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An electronic system, with closed loop current flow, and relative electrical potentials present across electrical components.

Electrical circuits are describable as having current flow in a complete loop, produced by some other form of mechanical, chemical, optical, nuclear, thermal or another energy. Man-made circuits being most often discussed. Electrical circuits permit the expedient delivery of energy from one location to another and/or from one type of energy to another. Anything that can be described as using electrical charge, in an electrical conductor, as a means of energy transmission, could fall into this category.