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Photovoltaic power generation shares the name 'solar power' with other technologies that capture energy directly from the sun. Unlike PV cells, which use light to produce electricity, concentrating solar power systems generate electricity with heat. PV or Solar cells operate on the principle that electricity will flow between two different semiconductors when they are put in contact with each other and exposed to light. By linking a number of these cells together a useful flow of electricity can be gathered. Such a collection of these PV cells constitutes a PV module.
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PV modules, because of their electrical properties, produce direct rather than alternating current (AC). Direct current (DC) is electric current that flows in a single direction - the type of current you get from a torch battery. Alternating current is electric current that reverses its direction at regular intervals, for example as supplied by utility companies through the national grid system. AC is required to run most large appliances, fridges etc.
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