Solar energy

Impact on the earth of 1 the sun:
The sun is playing a most important role in the energy system, its enormous energy, majority flow into space, the earth only share a small part. Penetrate to the solar energy on the earth, nearly have 30% while entering atmosphere, reflect back to the space because of meeting little dust and cloud; Nearly half the solar energy penetrates to the ground, make the earth surface warm; Other solar energy makes the water evaporation of the earth rise, meets the condensation to gather into the rain to the high altitude, and then lower and go back the ground, cause the circulation of water. Remaining solar energy of 0.13%, drive the wind, ocean current, and make the plant grow, breed.
Use of 2 solar energy:
Make use of solar energy to generate electricity, can change light energy or heat energy in the solar energy into the electric energy directly, because ways to collect energy are different, can be divided into the heat energy of the sun generate electricity and the sun light energy generate electricity.
(1)The heat energy of the sun generates electricity:
Utilize and gather the hot device, is it in order to obtain high-temperature heat source extremely, heat the sun heat energy job fluid make into the high-pressure vapour by promoting the turbine to generate electricity directly to assemble. Its system including sunlight is collected the hot device (speculum) , absorber, store hot device and energy converter (the turbine, generator) Wait for the device. Whether utilizing the sun, heat energy generates electricity because the sunlight is invited, size or the power is very great in change, and unable to supply in succession, so it is not high to change into the efficiency of the electric energy or the mechanical energy, gather hot board receive area of sunlight must be very heavy, so, still unable to use the heat energy of the sun in a large amount at present. Utilize solar energy it generates electricity to be relatively effect their with Company, LUZ of south, California of U.S.A., on MOJAVE SEGS solar energy power plant, desert of area in the world at present.
(2)The light energy of the sun generates electricity:
Utilize the solar cell component to change the light energy of the sun into a electricity way directly. The solar cell utilizes element silicon in nature, make P type and Model N semiconductor make straight negative pole, two semiconductor these absorb after the solar energy can produce electric potential difference and present the function of the battery ing. Such as the solar energy calculator, the sun expert's form. Use of the solar cell at present, only limited to less places of power consumption, it is with high costs that the reason unable to use on a large scale is that it is made and efficiency is low.