File:Copper_cathode_2.svg · Wikimedia Commons · See Wikimedia Commons
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A cathode is the positive terminal in a battery or similar device where positively charged particles are attracted and where electric current flows out. It matters because it's one of the two essential parts of a battery that makes electrical current flow, which powers everything from flashlights to electronics.
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Article · 中文
陰極（英文：Cathode）是發生還原反應的電極，相對于陽極為其對立面。 在放電的電池中，陰極為正極。正極指電源中電位（電勢）較高的一端。電流的方向為從正極流出，從負極流入。但是實際上電子的方向卻與電流方向相反，電子從負極流出，經由電路，到達正極。 经常与負極混淆，甚至在大多数英漢词典中，英文單字Cathode也被翻译成負極。事實上，只有在電解池中，陰極才与負極相关联。而在電池中，陰極是負極相反的存在，即正極。
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