Why not energy from light bulb is not converted back to electricity but from solar cell?

Question

anonymous · Answer

Because a light bulb does not emit UV rays. Its light has little energy to harvest. It would also meaningless to turn on light bulbs just so we can use their energy to turn on some more lights

koikkara · Answer

@ramuamt Hai Sweet Friend, WeLcoMe to OpeN stuDy.. !!

There isn't any energy in a light bulb. A light bulb is only an energy conversion tool. 

What happens to that energy has a couple of answers depending on what frame of reference you are using?
A lightbulb converts electrical energy into light and heat; so that is the immediate answer. 

However, eventually even the energy that leaves the bulb as light becomes heat after the light (radiant) energy strikes an opaque body (non-transparent). So it is also true that eventually all of the electrical energy that is converted by a light bulb eventually becomes heat.

Wondering If you are satisfied with this answer, Please close this Question. 

Thank You ! Keep in touch with Open Study.. Bye !

anonymous · Answer

Thank you very much.