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A: Cells use energy in order to grow, regulate metabolism and reproduce. This energy is obtained from a source such as food molecules or light from the sun, and through processes like glycolysis, the citric acid cycle and oxidative phosphorylation, an energy-rich molecule is then created.
Photovoltaic Cells: Converting Photons to Electrons Prev NEXT Â­Â­The solar cells that you see on calculators and satellites are also called photovoltaic (PV) cells, which as the name implies (photo meaning light and voltaic meaning electricity), convert sunlight directly into electricity.