A solar collector is a device for extracting the
energy of the
sun directly into a more usable or storable form. The energy in sunlight is in the form of
electromagnetic radiation from the
infrared (long) to the
ultraviolet (short) wavelengths. The solar energy striking the earth's surface at any one time depends on weather conditions, as well as location and orientation of the surface, but overall, it averages about 1000 watts per square meter on a clear day with the surface directly perpendicular to the sun's rays.
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