The most common form of
solar energy is photovoltaic. The word photo means light, and voltaic means energy. Photovoltaic cells
are made mainly out of silicon. The cells are thin circles, and rectangles. They are scattered about 3 to four
The cells work when
the suns light, photons hit the semi conductor. This is usually silicon. When the sun light hits the semi conductor
it frees some of the electrons. This creates an electrical current. About one watt which is the measurement of
electricity is created through the photovoltaic cells.