Discussion
Photovoltaic cells are used to convert ............. energy into electrical energy.
Answer: C
Photovoltaic cells convert solar energy into electrical energy.
A PV cell is a semiconductor junction, usually silicon. Photons of sunlight free electrons in the material, and the built-in field of the p-n junction drives them through an external circuit as direct current. This is the photovoltaic effect.
Tidal, hydro and wind power are converted mechanically: moving water or air turns a turbine that drives a generator. None of them uses a photovoltaic cell.
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