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交流電的千伏安與千瓦的區別,在於千瓦是指有功功率,千伏安包含了有功功率和無功功率,這在關於交變電流的研究,或者電工供電內容中涉及到; 通常,在純阻性負載電路中,因為無功功率為0,所以電路上1千伏安可以等於1千瓦,但是在非純阻性負載電路中電壓與電流的乘積並不完全做功,所以電路上 千伏安數=千瓦數/該電路功率因素; 一般在功率因素0.9的情況下,1千伏安的容量只能輸出0.9千瓦的功率
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