电感是导体的一个性质,用导体中感生的电动势或电压与产生此电压的电流变化率之比来量度。稳恒电流产生稳定的磁场,不断变化的电流(交流)或涨落的直流产生变化的磁场,变化的磁场反过来使处于此磁场的导体感生电动势。感生电动势的大小与电流的变化率成正比。比例因数称之为电感,以符号L表示,单位为亨利(H)。
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