[問題] 購物台賣的「省電」裝置
有時候一些第四台的購物台都會賣一種省電的裝置
宣稱只要找一個插座插上去就可以達到省電的效果
但各插座不都是並聯的嗎?怎麼想都覺得似乎不太可能...
所以這純粹只是噱頭...?(那怎麼能賣這麼多年)
還是有什麼特殊的物理原理在...
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