Photovoltaics

In a photovoltaic cell, light excites electrons to move from one layer to another through semiconductive silicon materials. This produces an electric current bcoz of basic principle i.e. motion of electrons produce the current.

SOLAR ENERGY.

Radiant energy produced in the Sun as a result of nuclear fusion reactions. It is transmitted to the Earth through space by electromagnetic radiation in quanta of energy called photons, which interact with the Earth’s atmosphere and surface.

The strength of the solar energy available at any point on the Earth depends, in a complicated but predictable way, on the day of the year, the time of day, and the latitude of the collection point. Furthermore, the amount of solar energy that can be collected depends on the orientation of the collecting object.