How is a variable resistor represented in TPC schematics?

In TPC schematics, a variable resistor is represented by a zigzag line with an arrow pointing to it. This distinctive symbol clearly indicates that the resistance can be adjusted, distinguishing it from fixed resistors which are typically represented with only a zigzag line. The arrow signifies the adjustable nature of the component, highlighting its ability to vary resistance in a circuit, which is essential for applications such as volume control in audio devices or adjusting light levels in fixtures.

The other representations provided correspond to different components, thereby clarifying the unique identity of a variable resistor within a circuit. Understanding this symbol helps in correctly interpreting a schematic, leading to effective circuit design and troubleshooting.