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Dec 26 2024, 9:01:43, ThuLogin ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 12345678 ]
Subject: Re: 無聊問題:水可以傳電,為何木不能


Author:
Red Rabbit
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Date Posted: 00:30:57 08/02/05 Tue
In reply to: Tatsuya Tanaka 's message, "無聊問題:水可以傳電,為何木不能" on 01:31:41 08/01/05 Mon

>因為水係液體,離子容易流動?
>又有人話,電壓高果時木都傳得電,傳唔傳電係睇電壓既不同
>咁好似膠呢d,如果夠電壓既話,都會傳電嗎?
>如果係....點解要分導電同不導電體....?
>希望有人可以解答....
你睇下舊野比雷劈下睇下傳唔傳。
電壓夠高乜都得啦

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[> Subject: 試答


Author:
好仁
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Date Posted: 15:56:32 08/02/05 Tue

傳電 : flow of electrons

水能傳電:理論上,純正的水 (distillated pure water)只有極少量的離子(mobile ions),因此導電能力極低。

水濕不要按電制:因為手上的水不是純正的水,例如水喉水就有大量能夠導電的離子,使手上的水成為電解質(electrotyles),故可以傳電。

電壓高可以傳電:正如定義所說,傳電即是電子的流動。當電壓極高時,就能將物質離子化(ionized),從而釋出電子(free electrons),故能通電。打雷正是因為高電壓使空氣被離子化而導電的結果,所以理論上在極高電壓下,任何東西也可導電。

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