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Comparison of pictorial and schematic styles of circuit diagrams
Common schematic diagram symbols (US symbols)
The circuit diagram for a four-bit TTL counter, a type of state machine

A circuit diagram (electrical diagram, elementary diagram, electronic schematic) is a graphical representation of an electrical circuit. A pictorial circuit diagram uses simple images of components, while a schematic diagram shows the components and interconnections of the circuit using standardized symbolic representations. The presentation of the interconnections between circuit components in the schematic diagram does not necessarily correspond to the physical arrangements in the finished device.<ref>Circuit diagrams and component layouts</ref>

Unlike a block diagram or layout diagram, a circuit diagram shows the actual electrical connections. A drawing meant to depict the physical arrangement of the wires and the components they connect is called artwork or layout, physical design, or wiring diagram.

Circuit diagrams are used for the design (circuit design), construction (such as PCB layout), and maintenance of electrical and electronic equipment.

In computer science, circuit diagrams are useful when visualizing expressions using Boolean algebra.<ref>{{#invoke:citation/CS1|citation |CitationClass=book }}</ref>


Circuit diagram sections
Intro  Symbols  Organization  Artwork  See also  References  External links  

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