Load - Electrical power being consumed at any given moment. The load that an electric generating system supplies varies greatly with time of day and to some extent season of year. Also, in an electrical circuit, the load is any device or appliance that is using power.
Parallel connected - A method of connection in which positive terminals are connected together and negative terminals are connected together. Current output increases and voltage remains the same. (See also series connected.)
Photovoltaic cell - The semiconductor device that converts light into dc electricity. The building block of photovoltaic modules.
Series connected - A method of connection in which the positive terminal of one device is connected to the negative terminal of another. The voltages add and the current is limited to the least of any device in the string. (See also parallel connected.)
Solar constant - The rate at which energy is received from the sun just outside the earth's atmosphere on a surface perpendicular to the sun's rays. Approximately equal to 1.36 kW/m2.
Thick cells - Conventional cells, such as crystalline silicon cells, which are typically from 4 to 17 mils thick. In contrast, thin-film cells are several microns thick.
Thin-film cells - Photovoltaic cells made from a number of layers of photo-sensitive materials. These layers are typically applied using a chemical vapor deposition process in the presence of an electric field.
Voltage regulator - A device that controls the operating voltage of a photovoltaic array.
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