What does a solid square represent in a TPC schematic?

In a TPC schematic, a solid square is used to represent a junction or node in a circuit. This symbol indicates a point where multiple circuit elements connect, allowing for electrical continuity and representing the interconnection of various components.

This junction can facilitate connections between wires, components, or paths, playing a crucial role in circuit design and organization. Understanding this symbol is essential for interpreting a schematic correctly, as nodes are fundamental to understanding how a circuit operates.

The options that denote a switch, fuse, or power source represent different functionalities and symbols entirely, such as different shapes or indicators that specifically denote those components. By focusing on the solid square as representing a junction, one can better grasp the layout and function of the overall circuit within the schematic.