You are thinking of a filament.
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In an incandescent light bulb the wire that gives off the light is called the Filament.
it is the coiled wire that heats up and gives off light in a incandescent (ordinary) light bulb.
In most home wiring circuits, the black wire is used to power a light bulb. The other wire is white and is called the neutral conductor.
As the name implies, support wires support the filament wire in the bulb, The filament, of course is the wire that glows white hot, giving out light
battery, wire, and light bulb