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Solar cells Solar cells are a form of semiconductor. Like batteries, solar cells have wires attached to two terminals. Shining light on a solar cell causes an electric current to flow. This reaction to light is a property of semiconductors. The current is then conducted through wires to devices, such as a calculator or a garden light beside the pathway to your front door. Using a calculator containing a solar cell, you can demonstrate that the calculator depends on the light shining on the solar cell for its power. Turn the calculator on and punch some numbers into the screen (choose a nice big number, like your income tax). Now, use your thumb to cover the solar cell. The solar cell is probably near the top of the calculator in a rectangular area with a clear plastic cover. After you’ve covered up the solar cell for a moment, the numbers fade away. Take your thumb off the solar cell, and the numbers reappear. Things powered by solar cells need light to work.

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Solar panel

Contributed by Puniksem on March 3, 2008, at 2:05 PM UTC.

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