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Photovoltaic system - Wikipedia.
In urban and suburban areas, photovoltaic arrays are often used on rooftops to supplement power use; often the building will have a connection to the power grid, in which case the energy produced by the PV array can be sold back to the utility in some sort of net metering agreement.
How do Photovoltaics Work? Science Mission Directorate.
This electricity can then be used to power a load, such as a light or a tool. A number of solar cells electrically connected to each other and mounted in a support structure or frame is called a photovoltaic module.
Photovoltaics - Wikipedia.
Solar PV has specific advantages as an energy source: once installed, its operation generates no pollution and no greenhouse gas emissions, it shows simple scalability in respect of power needs and silicon has large availability in the Earth's' crust, although other materials required in PV system manufacture such as silver will eventually constrain further growth in the technology.

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