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Science Education Project ﻣﺸﺮﻭﻉ ﺗﻌﻠﻴﻢ ﺍﻟﻌﻠﻮﻡ1 ﻛﻴﻒ ﻳﻌﻤﻞ ﻛﺎﺷﻒ ﺍﻟﺪﺧﺎﻥ؟ ﻛﻴﻒ ﻳﻌﻤﻞ ﻛﺎﺷﻒ ﺍﻟﺪﺧﺎﻥ؟ ﻳﻌﺘﺒﺮ ﺟﻬﺎﺯ ﻛﺸﻒ ﺍﻟﺪﺧﺎﻥ ﺍﻟﺬﻱ ﻳﺤﺬﺭ ﻣﻦ ﺇﻧﺪﻻﻉ ﺍﻟﺤﺮﺍﺋﻖ ﻣﻦ ﺍﻷﺟﻬﺰﺓ ﺍﻟﺰﻫﻴﺪﺓ ﺍﻟﺜﻤﻦ ﻷﻧﻬﺎ ﺗﻨﺘﺞ ﻋﻠﻰ ﻧﻄﺎﻕ ﻭﺍﺳﻊ ﻭﺑﻜﻤﻴﺎﺕ ﻛﺒﻴﺮﺓ٬ ﺍﻟﺤﺼﻮﻝ ﻋﻠﻰ ﺃﺣﺪ ﻫﺬﻩ ﺍﻷﺟﻬ ﺰﺓ ﻻ ﻳﺘﻄﻠﺐ ﺗﻮﻇﻴﻒ ﻣﻴﺰﺍﻧﻴﺔ ﻛﺒﻴﺮﺓ٬ ﻓﻬﻮ ﻻ ﻳﻜﻠﻒ ﻓﻲ ﻣﻄﻠﻖ ﺍﻷﺣﻮﺍﻝ ﺃﻛﺜﺮ ﻣﻦ ﺳﺒﻌﺔ ﺩﻭﻻﺭﺍﺕ٬ ﺣﺘﻰ ﻭﺇﻥ ﻟﻢ ﻳﻜﻦ ﻛﺬﻟﻚ ﻳﺠﺐ ﻋﻠﻰ ﻛﻞ ﺍﻟﻨﺎﺱ ﺍﻟﺤﺼﻮﻝ ﻋﻠﻴﻪ ﻷﻥ ﻓﺎﺋﺪﺗﻪ ﻓﻲ ﺇﻧﻘﺎﺫ ﺍﻷﺭﻭﺍﺡ ﻭﺍﻷﻣﻮﺍﻝ ﻻ ﺗﻘﺪﺭ ﺑﺜﻤﻦ. ﻳﺘﺮﻛﺐ ﻫﺬﺍ ﺍﻟﺠﻬﺎﺯ ﻣﻦ ﺟﺰﺋﻴﻦ ﺃﺳﺎﺳﻴﻴﻦ ﻫﻤﺎ ﻣﺴﺘﺸﻌﺮ ﻟﻠﺪﺧﺎﻥ ﻭﺑﻮﻕ ﻛﻬﺮﺑﺎﺋﻲ ﻋﺎﻟﻲ ﺍﻟﺼﻮﺕ٬ ﻭﻫﻮ ﻳﻌﻤﻞ ﻋﻠﻰ ﺑﻄﺎﺭﻳﺔ9 ﻓﻮﻟﺖ ﺃﻭ ﺑﻜﻬﺮﺑﺎء ﺍﻟﻤﻨﺰﻝ ﺍﻟﻌﺎﺩﻳﺔ) 120 ﻓﻮﻟﺖ.( ﺳﻨﺮﻛﺰ ﻓﻲ ﻫﺬﺍ ﺍﻟﻤﻮﺿﻮﻉ ﻋﻠﻰ ﻓﻲ ﺍﻟﻮﻗﺖ ﺍﻟﺤﺎﻟﻲ ﻭﻫﻤﺎ ﺃﻛﺜﺮ ﺍﻷﻧﻮﺍﻉ ﺍﻧﺘﺸﺎﺭﺍ ﺍﻟﻜﺎﺷﻒ ﺍﻟﻜﻬﺮﻭﺿﻮﺋﻲ ﻭﺍﻟﻜﺎﺷﻒ ﺍﻷﻳﻮﻧﻲ. ﻛﺎﺷﻒ ﺍﻟﺪﺧﺎﻥ ﺍﻟﻜﻬﺮﻭﺿﻮﺋﻲ ﻛﺎﺷﻒ ﺍﻟﺪﺧﺎﻥ ﺍﻟﻜﻬﺮﻭﺿﻮﺋﻲ ﻻﺑﺪ ﻭﺃﻧﻚ ﻻﺣﻈﺖ ﺍﻧﻈﻼﻕ ﺟﺮﺱ ﺗﺠﺎﺭﻳﺎ ﻣﻦ ﺣﻴﻦ ﻵﺧﺮ ﻋﻨﺪﻣﺎ ﺗﺪﺧﻞ ﻣﺠﻤﻌﺎ ﻣﺎ ﺃﻥ ﺗﺠﺘﺎﺯ ﻋﺘﺒﺔ ﺍﻟﺒﻮﺍﺑﺔ٬ ﻭﺍﻟﺴﺒﺐ ﻫﻮ ﺍﻟﻜﺎﺷﻒ ﺍﻟﺬﻱ ﻳﻌﻤﻞ ﺑﺎﻟﺤﺰﻡ ﺍﻟﻀﻮﺋﻴﺔ ﻭﺍﻟ ﻤﻜﻮﻥ ﻣﻦ ﺟﺰﺋﻴﻦ ﻋﻠﻰ ﻃﺮﻓﻲ ﺍﻟﺒﻮﺍﺑﺔ) ﻣﺼﺒﺎﺡ ﺃﺑﻴﺾ ﻭﻋﺪﺳﺔ ﺃﻭ ﻟﻴﺰﺭ ﻣﻨﺨﻔﺾ ﺍﻟﻘﻮﺓ ﻓﻲ ﻧﺎﺣﻴﺔ ﻭﻛﺎﺷﻒ ﻟﻠﻀﻮء ﻓﻲ ﺍﻟﻨﺎﺣﻴﺔ ﺍﻷﺧﺮﻯ( . ﻋﻨﺪﻣﺎ ﺗﻌﺒﺮ ﺍﻟﺸﻌﺎﻉ ﺍﻟﻀﻮﺋﻲ ﻳﺤﺲ ﺍﻟﻜﺎﺷﻒ ﻭﺟﻮﺩ ﻧﻘﺺ ﻓﻲ ﺍﻟﻀﻮء ﻭﻳﻌﻤﻞ ﻋﻠﻰ ﺇﻃﻼﻕ ﺍﻟﺠﺮ٬

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