Photovoltaic (PV) technologies convert solar radiation directly into electricity. The traditional building block for PV systems is the photovoltaic cell, a thin square plate or film of semiconductor material that measures around 10 cm x 10 cm. Solar radiation "falling" on the cell induces an electric voltage as a result of the photovoltaic effect. Several cells are interconnected and assembled in PV modules. These modules can be arranged in mounting structures in order to generate more power.