There are many schematic diagrams that are used to illustrate a series of electrical equipment, one of which and the most commonly used is a wire diagram.
Wire diagrams or wiring diagrams are simple work drawings / drawing diagrams that illustrate a series of cabling or wiring electronic equipment with the help of symbols in a simplified form.
Wire diagrams such as maps showing the functions of electronic devices and their constituent components which are interconnected as electronic circuits. And it shows the flow of current in electronic circuits.
In Figure diagram 6.4