如图所示,理想变压器原、副线圈的匝数比为10:1,电压表和电流表

如图所示,理想变压器原、副线圈的匝数比为10:1,电压表和电流表均为理想交流电表,从某时刻开始在原线圈两端加上交变电压,其瞬时值表达式为                                         则                         (    )

      A.电压表的示数为

      B.在滑动变阻器触头P向上移动的过程中,电流表A2的示数变小

      C.在滑动变阻器触头P向上移动的过程中,电流表A1的示数变大

      D.在滑动变阻器触头P向上移动的过程中,理想变压器的输入功率变小

 

答案

BD

解析:

 

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