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A circuit diagram (also known as an electrical diagram, elementary diagram, or electronic Schematic ) is a simplified conventional pictorial representation of an Electrical Circuit . It shows the different components of the circuit as simplified standard symbols, and the Power and Signal connections between the devices. Arrangement of the components interconnections on the diagram does not correspond to their physical locations in the finished device. Unlike a Block Diagram or Layout Diagram , a circuit diagram shows the actual wire Interconnect s being used. The diagram does not show the arrangement of components. A drawing meant to depict what the circuit actually looks like is called " Artwork " or " Layout ". Circuit diagrams are used for the design ( Circuit Design ), construction (such as PCB layout), and maintenance of electrical and electronic equipment. LEGENDS )]] On a circuit diagram, the symbols for components are labelled with a descriptor matching that on the list of parts. For example, C1 is the first Capacitor , L1 is the first Inductor , Q1 is the first Transistor , and R1 is the first Resistor (note that it isn't written R1, L1,…). The letters that precede the numbers were chosen in the early days of the electrical industry, even before the Vacuum Tube (thermionic valve), so "Q" was the only one available for semiconductor devices in the mid-twentieth century . Often the value or type designation of the component is given on the diagram beside the part, but detailed specifications would go on the parts list. SYMBOLS Circuit diagram symbols have differed from country to country and have changed over time. Simple components often have symbols intended to represent some feature of the physical construction of the device. For example, the symbol for a resistor shown here dates back to the days when that component was made from a long piece of wire wrapped in such a manner as to not produce inductance, which would have made it a Coil . These wirewound resistors are now used only in high-power applications, smaller resistors being cast from ''carbon composition'' (a mixture of Carbon and Filler ) or fabricated as an insulating tube or chip coated with a metal film. To illustrate this, European circuit diagrams have replaced the zig-zag symbol by a simple oblong, sometimes with the value in Ohm s written inside. A less common symbol is simply a series of peaks on one side of the line representing the conductor, rather than back-and-forth as shown here. Circuit symbols are standardized, using either ANSI standard Y32 or IEC standard 617. Different symbols may be used depending on the discipline using the drawing; for example, lighting and power symbols used as part of architectural drawings may be different from symbols for devices used in electronics. Linkages |
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