Subject: Electrons Going in and out of Filament?

 pretty much know how light bulbs work- I did a whole science fair project on 
them. Electrons go in one wire, the hit the tungston atoms, causing them to 
vibrate and heat up, and it raises an electron to a higher shell. When the 
electron falls back down, it releases a photo to compensate for the decrease 
in energy. Now I am having an aurgument with my science teacher (regular 
occurance). He says that the same amount of electrons that go into the 
filament come out. I disagree, and say that this is not posible because 
electrons carry energy, heat is energy, and light is energy. The same amount 
of energy can't come in and go out of something while CREATING energy(not 
possible). I say that some must be lost (electrons). Could someone please give 
me an explenation one way or the other?

Re: Electrons Going in and out of Filament?