推荐回答（2个）
我个人认为前面第一种表述是正确的，用阻抗还是导纳只是表示方式不同。比如变压器等值电路中，励磁回路就有两种表示方法，一种是以阻抗表示一种是以导纳表示。因为后者计算较为方便，故在电流系统计算中较为常见。
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