Solar power is sometimes used synonymously with solar energy or more specifically to refer to electricity generated by solar radiation. Solar energy has been exploited by man since ancient times, using a range of technologies. Solar radiation along with secondary solar resources such as wind and wave power, hydropower and biomass, are considered most available renewable energy on Earth.
How much supply
Earth receives 174 PW of solar radiation (heatstroke) entered in the upper atmosphere. About 30% is reflected back into space while the rest is absorbed by clouds, oceans and land masses. The spectrum of sunlight is most prevalent in the Earth's surface in visible and near infrared ranges , with a small part in the near ultraviolet.The total value of solar energy absorbed by Earth's atmosphere, the oceans and land masses is approximately 3,850,000 EJ per year. Photosynthesis captures approximately 3000 EJ per year in the biomass. The amount of solar energy reaching the planet's surface is so vast, that in one year is about twice as much for how it will ever get from all non-renewable Earth resources of coal, oil, natural gas, and extracted uranium, all combined.
How it works
Solar energy technologies can provide electricity generation by heat engine or photovoltaic means, space heating and cooling of active or passive solar buildings, potable water via distillation and disinfection, lighting, hot water, heat for cooking, heat and process for high temperatures for industrial purposes. Solar technologies, is characterized roughly as either active or passive, depending on how they capture, edit and distribute sunlight. Active solar techniques use photovoltaic panels, pumps and fans to convert sunlight into useful productivity.
Passive solar techniques include selecting materials with favorable thermal properties, designing spaces that facilitate the air flow naturally, and correlates the position of a building toward the sun. Active solar technologies increase energy offerings and they are seen as sources of secondary technologies, while passive solar technologies reduce the need for alternative resources and are generally considered sources of secondary technology applications.
Problems with solar power
They were and still are problems associated with solar progress, some real other invention. One of them is that the sun is not always shines, even in California, but there are enough solutions to fix this - it is part of serious problems, one of those invented by some skeptics, such as collapse of installation, this causing a even greater danger than nuclear fusion, but the idea of danger can not be totally contradicted.
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