Solar cells, also called photovoltaic (PV) cells by scientists, convert sunlight directly into electricity. PV gets its name from the process of converting light (photons) to electricity (voltage), which is called the PV effect. The PV effect was discovered in 1954, when scientists at Bell Telephone discovered that silicon (an element found in sand) created an electric charge when exposed to sunlight. Soon solar cells were being used to power space satellites and smaller items like calculators and watches.
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Solar Photovoltaic
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The Solar Refrigerator maintains a constant temperature helps basic health care and food products in hygienic condition for a long time. It is a very cost-effective energy independent model in rural health clinics.