posted by dave on .
Does a light bulb glow because....
a) there is burning inside
b) an electric current glows
c) the filament is hot
d) a very small current is flowing
Wouldn't you think it was because the filament was hot?
Of course, a very small current also CAN make a filament hot if the resistance is correct for the circuit; however, I think the intent of the question is to answer c.
That was my first choice, but does an electric current glow?
The filament in the bulb has resistance. The current flowing through the resistance of bulb causes the filament to dissipate energy in the form of heat and light. The filament is actually glowing white-hot because of the energy it is dissipating, thus giving off light. Therefore i think that your choice is correct.......thank you.....