Question : Inspite of the high cost, solar cells are widely used.

1.	Question : Inspite of the high cost, solar cells are widely used.
Answer» Solution :A special grade silicon is used for making solar cells and SILVER is used for interconnection of cells in panel. `rarr` This makes the solar cells expensive. `rarr` But it converts solar energy into electricity and about 0.7 W of electricity is produced when exposed to the Sunlight. `rarr` Solar cells and panels are widely used in artificial satellite, space probes like Mars orbiters, wireless transmission systems, radio or TV relay stations, traffic signals, calculators and in many toys. `rarr` At domestic level, maximum USE of solar energy can be ACHIEVED by USING solar roof top thus saving electricity. So, solar cells are widely used.

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