61.6 MB (4.8 MB compressed)
4111 x 5235 pixels
34.8 x 44.2 cm ⏐ 13.7 x 17.4 in (300dpi)
MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Solar-powered calculator resting on photovoltaic cells. Photovoltaic cells, the basis of solar energy, are made of a semiconductor material such as silicon. When incident light falls onto these devices a voltage is produced across the surfae. Solar-powered calculators are often also equipped with batteries.
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