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keemiline vooluallikas
Wiktionary:
11. a device which stores electrical power; used either singly or together in batteries; the basic unit of a battery

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https://en.wikipedia.org/wiki/Electrochemical_cell
https://en.wikipedia.org/wiki/Galvanic_cell
https://en.wikipedia.org/wiki/Fuel_cell
https://en.wikipedia.org/wiki/Solar_cell
https://chem.libretexts.org/Courses/University_of_California_Davis/UCD_Chem_002C/UCD_Chem_2C%3A_Larsen/Text/Unit_1%3A_Electrochemistry/1.1%3A_Galvanic_Cells

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- element (3)