CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY
Solar panels in the garden of a house. Each solar, or photovoltaic, panel is made up of many solar cells that convert light into electrical energy. The cells are made from a semiconductor. When light hits the semiconductor it releases electrons that are picked up by a grid of wires and form an electrical current. Solar power is an environmentally friendly energy source. Photographed in Catalonia, Spain.
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