The origin of the glow from the filament inside the ac incandescent lamp in your bedroom is
A)electrons resupplied by the wall outlet.
B)electrons already in the filament.
C)the positive charges that flow in the filament.
D)resistance in the filament.

Question

Quizplus · Accepted Answer

The glow in the filament of an AC incandescent lamp is due to the heating effect of the electric current passing through the filament. When a voltage is applied across the ends of the filament, the free electrons in the filament start moving from one end to the other. The resistance in the filament makes it difficult for these electrons to pass through it, and as a result, they collide with the atoms and ions in the filament. These collisions generate heat, which makes the filament glow. Therefore, the origin of the glow is the free electrons already present in the filament, not the electrons resupplied by the wall outlet or any positive charges flowing in the filament.

The Origin of the Glow from the Filament Inside the Ac