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熱能的傳輸有三種形式: 傳導、對流和輻射, 光輻射也是熱能的一種形式, 白熾燈中鎢燈絲工作時的熱量85~90%是經傳導、對流散發,15~10%是經光輻射散發.
最直接的肯定是電能 但是電能可能來自化學能
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