This class experiment was about solar cells, and they are also called photovoltaic. When a source of light is aimed to the cells it can generate electricity without a power source. According to Wikipedia “The term “photovoltaic” comes from the Greek φῶς (phōs) meaning “light”, and from “volt”, the unit of electro-motive force, the volt, which in turn comes from the last name of the Italian physicistAlessandro Volta, inventor of the battery (electrochemical cell). The term “photovoltaic” has been in use in English since 1849.[1]“.

The Experiment was to measure the voltage generated from the applied light from the flashlight. We took several measurements from several distances. We can see the relation between the distance and the voltage generated from the cells and the applied light.

It can be seen from the chart, when the distance is reduced the voltage generated becomes higher and higher. This experiment proves the relation between the quantity of light applied to the solar cells and the voltage generated.

After we finished these measurements, we were introduced to colored filters. This experiment is similar to the first one; however, the difference here is we do not change the distance; what we have to do is we change the colored filters and measure the voltage. The following chart will show my results.

It is shown in the chart that red filters absorb most of the light, then blue after that green.

In conclusion, this experiment gave us a brief idea about solar cells and how voltage are generated using solar cells

http://en.wikipedia.org/wiki/Solar_cell