Used to show circuit schematics - a ladder type simple circuit diagram with

• Used to show circuit schematics - a ladder type simple circuit diagram with

• vertical rails representing line power 1 and 2 (feed and return, or +, -)
• Rung(s) representing the circuit components and designed task

• Here is an example of a simple switch and lamp circuit with one rung level in the form of a hardware mechanical/electrical circuit :