兩條問題~關於物理(20點)

圖片參考：http://cg-love.com/s9/18f5hx1.GIF


冇錯！D 雷電經過既導體通常都會超熱氧化變黑色，因爲瞬間超大電流經過，所以變爲熱能係對既。


圖片參考：http://cg-love.com/s9/p8x1fc_.GIF

電壓太高而激活導致放電產生火花，所以變爲熱能都係對既。


2008-12-27 08:49:20 補充：
電流由高電位流向低電位，如果有一更低電位物體係附近，電流會轉向該物體。咁流向低電位之後無更低電位物體係附近呢，其實理論上係有既，就好似瀑布既水向低流，流到盡頭後就流向更低既河，等到河水流到海口時就會減少高低點，到佐水位一致時就會停流，電位都有一個飽和點既，當兩個電位一致時就會也會停流。

2008-12-27 08:54:40 補充：
任何電放出後如果唔變爲機械能都會轉化為：1：熱能，2：光能，3：化學反應等等

2008-12-27 08:56:56 補充：
機械能爲磁場效應，仲有輻射，電磁波等好多好多

問題一:
http://cg-love.com/s9/18f5hx1.GIF
轉化成為熱能。

問題二:
http://cg-love.com/s9/p8x1fc_.GIF

電流由高電位流向低電位，如果有一更低電位物體係附近，電流會轉向該物體。

Q1: In a lightning preventor, there is a copper strip that runs along the external wall of the building connecting the lightning preventor and earth. The electric current from ligntning strike will pass through the copper strip directly to earth without going through the concrete wall.
As you should have known that both the building and the lightning preventor are at earth potnetial. Hence, most (almost all) of the energy from ligntning discharge is expended in heating up the air during the strike. Thus causing the light flash and thunder.
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Q2: In a similar reason as explained in Q1, most energy from the discharge is used to heat up the air in between the two spheres, in a way similar to an electric current passing through a resistor or a heating coil in an electric oven. The heating causes ionization of the air molecules as well as sudden expansion due to increase of temperature, causing the 'hissing' sound that you heard.

問題一:
首先行雷個時打中避雷針之後
電唔會經水泥落地下
如果真係咁既話
我地個時掂住牆既話咪會觸電?!!
其實行雷係因為雲層既電太多
發生 electric breakdown
所以向地上面既導電體過電
而當中所發出既電就俾地球
(巨形既球體所儲起)
但係因為地球體積好大
所以其實係冇影響地球上既磁場

問題二:
係 electric breakdown個時
係 conductor 既電累積得太多
令空氣暫時變到可以導電
而佢會發光係因為導電既過程
令到空氣份子中既電子增加左能量
之後係回復能量既時間
兩個能量層之間既距離
如果波長係係人類既可見光範圍之內
就會令我地見到光