March 2017
Intermediate to advanced
232 pages
4h 44m
Chinese
Content preview from 自造手冊：新工業革命實務指南
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Hello World!
127
止，您手邊的東西只不過是電池盒紅色
電線的延長線，再加個電阻。
把 LED 的兩隻腳拉開一點，將這條電線
綁在 LED 較長的腳上，一樣用膠帶固定
好。最後，將 LED 較短的那隻腳接到電
池盒的黑線。
圖 15-1
是電路的接法。
圖 15-1
我們的電路初版
現在您只要接上電池然後…Hello World ！
您的 LED 燒掉了嗎？
如果 LED 不是愉悅地亮起，得到的結果
是啪一聲，接著是一陣煙與臭味的話，
那您剛好學到一件很重要的事：接電之
前請確認電阻真的接好了。如果您未使
用任何電阻，或接線時不小心忽略掉它，
LED 會收到過多的電流而燒毀。
如果您渴望親身體驗 LED 毀滅秀的話，
請注意以下警告：嘗試時不要用手握住
LED、戴上護目鏡，並在通風良好的地方
做這件事。
電流、電壓與電阻
水與電有什麼共同的地方呢？您會嚇一
跳呢。水可以幫助我們理解電是如何運
作的，因為我們只要比較兩者就能輕易
說明許多現象。我做這樣的比喻不是第
一人也非原創，許多電子學老師都經常
這麼做。
首先，思考一下電力是從哪產生的。在
原子（
圖 15-2
）中，質子與中子構成了
原子核，電子則圍繞在原子核旁。各種
電子現象就是由電子的特性所產生。質
子具有正電荷，電子具有負電荷，中子
則不具任何電荷。
在金屬中，電子可在其原子核中自由跳
躍，並在金屬材料中四處移動。當在某
塊金屬的電位與另一塊有高低
差時，電
子就會流過（速度是光速）這些材料。
如果您直接把電池接到一片金屬，電子
會以非常快的速度流動，金屬（與電池）
很快會熱起來，並且持
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.