What type of lines from the power source are represented in a ladder diagram?

In a ladder diagram, the power source is represented by vertical lines. These vertical lines symbolize the electrical supply in the diagram and serve as the primary framework, or "rails," from which other elements of the circuit are depicted. The vertical components typically connect to horizontal lines that indicate various loads, devices, or control elements within the electrical circuit. This format allows an easy visual representation of the relationships and interactions between different components.

Understanding the purpose of ladder diagrams is crucial in fields like electrical and plumbing, where they are commonly used to illustrate control circuits and relay logic. The vertical lines effectively communicate the flow of power, making it clearer for technicians and electricians to analyze and troubleshoot the system.