עמוד:26

Enrichment Power Plants and “ Clean” Energy Sources Almost all of our home appliances operate on electrical energy , which we use in many places outside of the home as well ( street lighting , traffic lights , and more ) . Electrical energy is produced in a large facility called a power plant . In most power plants , electrical energy is produced by a turbine that is connected to a generator . The turbine is a wheel equipped with blades that are mounted on a common shaft . A generator is a device that converts kinetic energy to electrical energy that is generated when an internal part in it revolves . When the turbine revolves , it causes the generator to revolve as well , thus producing electrical energy . Up until recently , the most commonly used method for producing electricity was through the burning of fuels such as coal , oil , and natural gas . Burning fuel produces heat , and the heat heats up water . The water turns to steam ( water vapor ) in motion . The moving steam turns the turbine , which turns the generator , and the generator produces electrical energy . When fuel burns , greenhouse gases * are emitted into the atmosphere , causing global warming . One way of dealing with this problem is to gradually switch to energy production processes that do not emit greenhouse gases . Examples of these processes are described below . Greenhouse gases : Gases that do not enable heat radiated from the warming earth to be emitted back into space . Wind : Air movement is used to turn the turbine . The wind turns the turbine , which in turn turns the generator connected to it . The generator converts the wind’s kinetic energy into electrical energy . Solar cells : Sunlight strikes the solar cells , which convert the radiation energy into electrical energy . Geothermic sources : In this case , heat from the depths of the earth is used to produce moving steam , and the steam turns the turbine .

מטח : המרכז לטכנולוגיה חינוכית


לצפייה מיטבית ורציפה בכותר