When elctrons pass through a bulb it poduces heat and light why?

[khizman]

??

 

[ranger]

This may help you.

http://science.howstuffworks.com/light-bulb2.htm

As the electrons zip along through the filament, they are constantly bumping into the atoms that make up the filament. The energy of each impact vibrates an atom -- in other words, the current heats the atoms up. A thinner conductor heats up more easily than a thicker conductor because it is more resistant to the movement of electrons.

Bound electrons in the vibrating atoms may be boosted temporarily to a higher energy level. When they fall back to their normal levels, the electrons release the extra energy in the form of photons. Metal atoms release mostly infrared light photons, which are invisible to the human eye. But if they are heated to a high enough level -- around 4,000 degrees Fahrenheit (2,200 degrees C) in the case of a light bulb -- they will emit a good deal of visible light.

Basically its energy being transformed.

 

[astrokreng]

Electrons passing through a bulb causes heat and light because of the way the bulb is designed. The bulb contains a thin filament made of a material with high resistance, such as tungsten. When an electric current (made up of electrons) passes through this filament, it encounters resistance and starts to slow down. This slowing down of the electrons causes them to release energy in the form of heat and light. The heat produced is due to the collisions between the electrons and atoms in the filament, which causes the atoms to vibrate and release thermal energy. The light produced is a result of the electrons releasing photons, which are particles of light, as they move through the filament. This combination of heat and light production is what makes bulbs an efficient source of illumination.