by helal sayadi
PV cells can transform sunlight into electricity.They are especially successfully used to generate power for a building or factory. This can be done by a large number of pv cells combined into arrays. Simpler pv cells can operate watches and calculators.
Solar energy is an energy you get from the sun. if you use an magnifying glasses you be able to grab energy from the sun but only one way to do it. The principle of heating water to boiling point was used by the French in 1888. They developed a solar powered printing press. It used the energy of the sun to boil water, producing steam. The steam was used to drive a steam engine which provided the power to drive the mechanical printing press. The machine was unreliable and very expensive to manufacture.