發電的原理是什麼?

你話水力發電, 火力發電, 風力發電, 全部都係轉動發電機切割磁力線去發電冇錯, 但係太陽能發電, 化學電池發電, 核子反應堆發電, 敲打石英發電就冇用轉動發電機切割磁力線去發電, 仲有切割磁力線唔一定產生交流電, 仲可以產生直流電, 再落來就係切割磁力線唔一定係轉動機械能來轉換電能, 好似呢把手電筒只要用來搖就可以發電, 完全冇用到機械同埋冇轉動。

圖片參考：http://www.alighting.cn/UploadFile/News/Alighting_20070727105633.jpg


圖片參考：http://www.alighting.cn/UploadFile/News/Alighting_20070727105314.jpg



圖片參考：http://www.alighting.cn/UploadFile/News/Alighting_20070727105413.jpg

所有答案度係肯定100%準確唔係大約, 而且完全冇提到‘能量’二字。

唔用‘能量’轉換就冇得解析。
譬如 : 用人既手力去搖動電筒, 電筒内有一個磁鐵, 當搖動手電筒時, 磁鐵既磁力線就會切割導體(線圈)而產生電能, 呢啲都係‘能量轉換’如果你冇手(人既能量)去搖支電筒, 佢自己係唔會發電既。

http://zh.wikipedia.org/wiki/%E7%9B%B4%E6%B5%81%E9%9B%BB



2010-02-23 02:00:38 補充：
【設計原理】利用法拉第原理，封閉線圈在磁場中切割磁力線會產生感生電流。因此前後晃動裡面的磁鐵，線圈內便可產生電流，電流儲存在電容中，便可供給手電筒照明了。
【環保設計】不需要電池，采用進口電容，手搖將機械能轉為電能即可充電髮光，不但節約能源，而且也沒有更換電池及電池廢棄了汙染環境的缺點。。
■不需更換燈泡，采用超高亮度LED燈，具有壽命長、亮度高的優點,照明壽命達10萬小時以上。
■強力钕鐵硼高密度磁鐵，髮電效率比普通磁鐵高5倍。利用光學凸透鏡原理，聚光性能更強，可照明距離更長

2010-02-23 10:56:37 補充：
改

呢把手電筒只要用來搖就可以發電, 完全冇用到轉動既機械能。


髮電 = 發電

You are right that induced emf (electromotive force) is due to cutting of megnetic field lines by a conductor. In fact, "cutting of field line" is just a simplified physics concept for the understanding of high school physics students.

The origin of induced emf is due to Lorentz Force. This is a force given to a moving charge in a magnetic field. The force is proportional to the speed of the charge, the strength of the magnetic field, and the amount of charge itself.

The force arisies because of interaction of the external magnetic field and the magnetic field produced by the moving charge (just think of a moving charge consitutes a current, which produces a magnetic field around it).

Conductors are full of free charges (electrons), when the conductor moves in a magnetic field, this also brings the electrons to move with the conductor. As a reuslt, Lorentz force acting on the electrons drives them to move in one direction. This is the induced current.