A circuit diagram makes use of standardized symbols that represent electrical components or devices. It is easier to draw these symbols than drawing the concrete pictures of the components.
The actual components might change appearance as the electronics industry revises them or renders them obsolete. The diagrams describe the way in which the components are connected electrically. There are drawn lines that stand for wires or conductors between the appropriate connection points on the symbols; no particular type of wire or physical distance between components is implied; two components might be separated by a few inches or centimeters or a meter or feet.
ConceptDraw PRO provides templates and samples of technical drawings and engineering diagrams (electrical schematics, digital and analog logic, circuit and wiring schematics and diagrams; power systems diagrams; maintenance and repair diagrams for electronics and electrical engineering; block flow and process flow diagrams, piping and instrumentation diagrams for chemical and process engineering; part, assembly, pneumatic, and hydraulic systems drawings for mechanical engineering).