SOLAR ENERGY
              SOLARENERGY
     We get most of our energy 
      from the sun. We call it solar 
      energy.
     It travels from the sun to 
      the earth in rays. Some 
      are light rays that we can 
      see and we can’t see, like 
      x-rays.
     The sun is a giant ball of gas. 
      It sends out huge amounts of 
      energy every . 
     Most of the energy goes off 
      into space. Only a small part 
      reaches the earth.
     
      Solar energy, radiant light and heat from the sun, 
      has been harnessed by humans since ancient times 
      using a range of ever-evolving technologies. 
     
      Solar radiation, along with secondary solar-powered 
      resources such as wind and wave power, 
      hydroelectricity and biomass, account for most of the 
      available renewable energy on earth.
     
       Only a minuscule fraction of the available solar 
      energy is used.
     
      Solar powered electrical generation relies on heat 
      engines and photovoltaics. 
     
      Solar energy's uses are limited only by human 
      ingenuity
                  MECHANISM
      HOW TO TURN SOLAR ENERGY INTO 
       ELECTRICITY
      In photovoltaic technology that converts solar 
       energy from the sun into electricity.
      Photovoltaic cells are made up of two or more thin 
       layers of semi-conducting materials.
       Today the most commonly used semi-conducting 
       material used in photovoltaic cells is silicon. 
      When silicon is exposed to light, an electrical 
       charge is generated in the form of direct current, 
       which can be conducted away with metal contacts. 
     SOLAR ENERGR AT  WORK
     
      When we burn fossil fuels we 
      are releasing the solar energy 
      that is trapped within them. 
     
      The sun also drives the earth's 
      weather systems and creates 
      the winds that we can harness 
      to create even more electricity 
      from.
     
       Even the ocean's waves that 
      are controlled by the sun can be 
      converted into usable electrical 
      power.