1. By: Alejandra Gálvez Tornel
THE LIGHTBULB
By: Alejandra Gálvez Tornel

2. The lightbulb was invented in 1879 by Thomas Alva Edison.
HISTORY
The lightbulb was invented in 1879 by Thomas Alva Edison.

3. FUNCTIONS
There functions are: delivery in dark hours or in places where there is no light.

4. PERFOMANCE
It has a glass globe in which a vacuum is created and in which a filament to be traversed by an electric current emits visible light is.

5. ADVANTAGES AND DISADVANTAGES
The bulbs have evolved, now we find light bulbs and little polluting; We provide lighting without which it would not be possible overnight functions, allowing the cities safer and that roads are passable in low light moments. Among its drawbacks it is that once they are cast your material must be recycled, if not always happen because we are not aware and which contribute to the so-called light pollution.

6. END