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A chemical reaction in green plants in which carbon dioxide from the atmosphere combines with water to form carbohydrates, using the energy of solar radiation.
Photovoltaic (PV) effect
The result of electrons being freed from impurities in semiconductors by the quantum energy of light photons, so that the electrons move to generate both electrical potential and current. The principle behind solar cells.
The energy released by directly burning fossil fuels or consumed at source in electricity generation.