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1 The set of physical phenomena associated with the presence and flow of electric charge. 
2 A device that orients a payload toward the sun.
3 In electronics, a function that converts digital data (usually binary) into an analog signal (current, voltage, or electric charge) and vice versa.
4 An electronic device or circuitry that changes direct current (DC) to alternating current (AC)
5 A list of prices for such things as rail service, bus routes, and electrical usage.
6 A device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy. 
7 In physics, a property of objects, transferable among them via fundamental interactions, which can be converted inform but not created or destroyed.
8 A set of solar photovoltaic (PV) modules electrically connected and mounted on a supporting structure.
9 A technique that grid connected inverters, solar battery chargers and similar devices use to get the maximum possible power from one or more photovoltaic devices, typically solar panels.
10 One of the most advanced countries in the development of solar energy, and it is one of the European countries with the most hours of sunshine.
11 An interconnected network for delivering electricityfrom suppliers to consumers.
12 A flow of electric charge.
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