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电容元件的交流电路中，容抗以及电压与电流相位分别为

A. Xc=1/ωC，超前900 B. Xc=1/ωC，落后900C. Xc=ωC，超前900 D. Xc=ωC，落后900

2025-03-31 13:59:13

推荐回答（1个）

回答1：

B. Xc=1/ωC，落后900 容抗的大小见它的定义，电压为零时，其电压变化率（△q/△t）为最大，电路中电流也最大。反之，当电压为最大值时，其电压变化率（△q/△t）为零，电流也为零。所以电路中电流的相位超前于电容两端电压的π/2。

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