While that seems evident, a problem is that a DC power source is often from AA or AAA cells which can be installed in the reversed position. A connector is NOT involved to start with. Sure, the problem is not there if your power source is from an USB cable (or another similar unidirectional connector), but then, the widget-gizmo MUST be used besides a desktop PC, or something like it.To prevent the reverse connection of a power supply, ensure that connectors and plugs are designed to be unidirectional, meaning they can only be connected in one orientation. Additionally, label connectors clearly, use color-coding, and provide training to users to avoid incorrect connections.