The source of electrons lighting an incandescent ac light bulb is
A) the source voltage.
B) electrical outlet.
C) the power company.
D) the wire leading to the lamp.
E) atoms in the light bulb filament.

Question

Quizplus · Accepted Answer

The electrons that light an incandescent AC light bulb come from the atoms in the light bulb filament. When electrical current passes through the filament, it causes the filament to heat up and emit light. The electrons themselves are not provided by the power source but are already present in the conductive material of the filament and are set into motion by the electric field created by the applied voltage.

The Source of Electrons Lighting an Incandescent Ac Light Bulb