Examlex
By the end of the fifth century in the West, which of the following was true?
Concrete Wall
A robust and durable barrier made of concrete blocks or poured concrete, commonly used for structural and protective purposes.
Photovoltaic Cells
Devices that convert light energy directly into electrical energy through the photovoltaic effect, commonly used in solar panels.
Natural Gas Furnace
A heating system that burns natural gas to produce heat for space heating in residential or commercial buildings.
Passive Solar System
A design approach that utilizes the sun's energy for the heating and cooling of living spaces by exposure to the sun.
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