如图所示,理想变压器的原线圈接在u=220  sin (100πt) V的交流电源

如图所示,理想变压器的原线圈接在u220  sin (100πt) V的交流电源上,副线圈接有R55 Ω的负载电阻.原、副线圈匝数之比为21.电流表、电压表均为理想电表.下列说法正确的是                                                        (  )

A.原线圈中电流表的读数为1 A

B.原线圈中的输入功率为220  W

C.副线圈中电压表的读数为110  V

D.副线圈中输出交流电的周期为50 s

答案

A

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