The answer to the previous question is A. On the left are two flat-panel solar collectors for heating hot water. Tubes are another solar thermal technology. The three panels to the right are solar photovoltaic modules that convert sunlight to electricity.
Next question: What is this device?
A. A tank for a domestic solar hot water system.
B. A Tesla coil for generating high-voltage electricity.
Answer and new question on next page.
March 16, 2009 4:00 AM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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