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電（英語：electricity）是靜止或移動的電荷（带电粒子）所產生的物理現象，具有能量，是自然界四种基本相互作用之一。在大自然裡，電的機制給出了很多眾所熟知的效應，例如閃電、摩擦起電、靜電感應，...