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photovoltaic cells (PV cells)

Pronunciation:   fO-tO-vol-tA-ik selz
   
Definition : These are devices that convert sunlight directly into electrical energy. A PV cell is usually made with silicon and a doping agent (an agent that gets excited by sunlight). When the sunlight strikes the PV cell, the sun's radiation is turned into an electrical signal.
   
Facts: Photovoltaic cells require direct sunlight to work.