Posted: Sun Feb 16, 2020 11:38 pm
How do light bulbs work? I know that photons are emitted when an electron is excited to a higher energy level and then drops back, but if electricity is just a flow of electrons, how does that make electrons in the light bulb do this? Also, where do the electrons that are making this happen go?
Re: Light bulbs? [ENDORSED]
Posted: Mon Feb 17, 2020 6:45 pm
The electric current flowing through the lightbulb metal filament causes heating of the metal filament. This heating causes electrons in the metal filament to be excited to higher energy states.
When the excited electrons return to ground state they emit light.
Ask me in class to comment on this.