A rectangular, wooden-framed electrical circuit demonstration board is positioned against a light-colored, textured wall in Sliven, Bulgaria

A rectangular, wooden-framed electrical circuit demonstration board is positioned against a light-colored, textured wall in Sliven, Bulgaria. The board features a dark brown surface displaying a schematic of an electrical system with various colored lines (white, yellow, green, red, blue) representing pathways. Multiple circular receptacles in black, yellow, and red are present on the board, some interconnected by short white jumper wires forming specific circuit configurations. On the left, two grey rectangular symbols likely represent transformers. In the lower right, a white stick figure points toward a red receptacle. Small green indicator lights are visible at the top of the board. A small, black square component with a circular aperture is partially visible on the top edge of the board, slightly off-center left. The board rests on a light-colored, mottled floor, with a darker, diagonal line across the lower left foreground. No individuals are present in the scene, and no active interactions are occurring.