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ENERGY, image, image, image, image, image, image, image, image, image,…

- - - - the heat generated by solar radiation produces steam that is used to move the rotor in the generator
      - They use special mirrors, called heliostats.
    - - Solar radiation is transformed into electricy by photovoltaic cells.
      - Consist of large areas of photovoltaic panels.
      - Isolated power plants are use to supply electricy to homes in rural areas.
- - - - Large hydroelectric power plants require water reservoirs covering large areas.
      - Conventional thermal power plants can cause numerous problems and environmental hazards.Produce ir polution, increses the greenhouse effect, cause acid rain, affect animal and plant life.
      - Nuclear thermal power plants are accompanied by the risck of
        nuclear accidents and the problem of nuclear waste,
- - - - The turbine converts mechanical energy into the rotatin movement of a shaft
      - An alternator has a fixed part, called a stator, and a moving part,
        called a rotor, connected to the turbine shaft
      - As the rotor shah moves, alternating electrical current is produced on each of the stator's coils.
  - - - Electric power plants are usually located far away from the points where the energy is used
      - Electricity cannot be stored; therefore, it must be transported to
        consumption centres
      - several processes
        
        Transporting it by high voltage cable attached to towers
        
        Decreasing the voltage at the electncity substations to 3-30 kV
        
        Increasing the voltage to 220 000 V or 400 000 V to prevent signifcant energy loss, due to the Joule effect
        
        Distribution to homes, offices, industries and public facilities During this srage, the voltage is reduced to 230-400 V.
- - - - Electricy is generated as a result of two combined cycles, a cycle that uses air and gas, and a conventional thermal cycle During the first cycle a gas turbine is used that includes a compressor.
      - Air is mixed with the gas and is burnt, which generates electricy in the turbine-alternator system. The combustion gases are transported to a boiler, where they transfer their energy to the water during the second cycle.
  - - - water used follows the course of a river and will not be reused.
    - - wa ter descends into a reservoir located at a lower height, them pumped to a higher reservoir to reuse it.