All of the holes in a selected row or column are internally connected. Connected holes are called nodes. In order to interconnect rows and columns (nodes) a cable is needed going from a hole in the column to a hole in a row. The five holes in the column are electrically connected.
https://www.sciencebuddies.org/science-fair-projects/references/how-to-use-a-breadboard
A positive bus (power rail) can be identified through power, plus sign, and red color.
A negative bus (power rail) can be identified through ground, negative sign, and blue or black color.
Breadboard Diagram: Different from schematic and circuit diagram which use symbols to represent electrical components; breadboard diagrams show components to how they actually look like.
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