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妳要先計算需要多少的電阻
V=IR電壓=電流X電阻
機車發動時電壓會高於12V
我們用14V來算
14V=你買的LED上有寫限流(我用我買的來當好了)25MA*?
然後燈泡的亮度我們取9成就可
25*0.9=22.5MA=0.0225A
代入公式
14V=0.0225*? ?=14/0.0225=622.222222
我們取625
然後市面上賣的電阻還有分4/1 2/1 1 .......
這時我們就用 P=IV功率=電流X電壓
P=0.0225*14V
P=0.315
4/1是0.25
2/1是0.5
剛好這個值是介於兩者之間
我們就用2/1以免燒毀

螢光棒的話
他的輸入電壓因該為12V
我們算一下
加一個4/1瓦100歐姆在正極即可


由電瓶正負各接1條過來你要放螢光棒的位置
之後就是最簡單的正接正 負接負


以下內文出自: http://tw.knowledge.yahoo.com/question/question?qid=1608090509548led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒 led 螢光棒
本文引用自: http://tw.knowledge.yahoo.com/question/question?qid=1608090509548led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒led 螢光棒
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