Electricity flows in a loop. When the switch is closed, current travels from the battery, through the wires, and lights the bulb.
Open the switch and the loop breaks — no current, no light.
The dimmer slider changes how much current flows — slide it up for a brighter bulb, down to dim it.
The current meter shows how much current is moving. More current means a brighter bulb!
Series puts two bulbs on one path, so they share the energy and look dimmer.
Parallel gives each bulb its own loop, so both shine full bright.
Fix the Wire: a wire is secretly broken. Tap along the wires to find the gap and snap it shut!