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1、單擊此處編輯母版標(biāo)題樣式,單擊此處編輯母版文本樣式,第二級(jí),第三級(jí),第四級(jí),第五級(jí),*,*,單擊此處編輯母版標(biāo)題樣式,單擊此處編輯母版文本樣式,第二級(jí),*,The most important invention-Light,Introduction,The First Electric Light,Made in 1809 by,Hunphry Davy,this is called the,electric arc.,Late,The American,Charles Francies Brush,manufactured,some carbon arcs.,The Inventor,Th
2、omas Edison,experimented with thousands of different materials,eventually produced a,bulb,that could glow for over 1500 hours.,漢弗萊戴維爵士（法拉第的老師）,k,電弧,manufactured,mnjfkt 制造，加工（manufacture的過去式）,carbon arcs,電 碳弧,bulb,blb 電燈泡,There are three kinds of light.,1.Incandescent lamp(白熾燈)：,a.Incandescent lamp （
3、白熾燈）,b.Tungsten halogen lamp（鹵鎢燈）,c.Halogen lamp （鹵素?zé)簦?.,2.High intensity discharge lamp-HID（氣體放電燈）,a.Fluorescent lamp（熒光燈）,b.Sodium lamp （鈉燈）,c.Metal halide lamp（金屬鹵化物燈）,.,3.Others.,a.E,lectrodeless,L,amp（高頻無極燈）,b.L,ight,E,mitting,D,iode（發(fā)光二極管）,.,In the early 19th century，,a,British chemist,made th
4、e first arc lamp in the world by using 2000,cells(電池）,and 2 carbon rods.,But this kind of light is too strong,，,it cannot be used in the house but only in the street.,In,1879,By Thomas Edison-an American inventor,The temperature of the,filament,:3000,A,verage,life span,:,1000,h,Its a lamp which rank
5、s first in the production,of the world.,But many countries are trying to stop using it,because of its heavy pollution.,Incandescent lamp,（,白熾燈,）,filament,flmnt 燈絲,life span,壽命,Compare to,Incandescent,l,amp,this kind of lamp,has,longer life span(4000h)and,h,igh,er,light efficiency,.,It It is often us
6、ed in the meeting room,t,he exhibition hall,and the stage.,T,ungsten,H,alogen,L,amp,（,鹵鎢燈,）,light efficiency,光效率,F,luorescent,L,amp（,熒光燈,，,俗稱日光燈,）,Long,life span,:2500h3500h,H,igh light efficiency,G,ood color rendering,The temperature of the filament,:,1000,color rendering,顯色性,S,odium,L,amp,(,鈉燈,),T
7、he highest l,ight efficiency,.,Fog permeability,Life span:20000h,Be used in roads,airports,terminals,highways,etc.,Fog permeability,透霧性,E,lectrodeless,L,amp,（,高頻無極燈,）,Very long life span:40000h80000h,Energy saving,Brighter,So,it is often used in some places which have,higher requirements for safety.
8、,Such as,tunnels,subway stations and factories.,tunnels,隧道,L,ight,E,mitting,D,iode（發(fā)光二極管）,Same features as e,lectrodeless,l,amp,but,more energy saving.,It is secure when it w,ork under the,low,thermal voltage,.,And its surface temperature less than 60,.,low,thermal voltage,低熱電壓,What will happen if our world have no light?,The ordinary light,it is a witness of human conquest of the night.,Thats all,thank you!,
最重要的發(fā)明電燈課件
