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【多选题】
如图 4 所示,将额定电压为 60 V 的用电器通过一理想变压器接在正弦交流电源上.闭合开关 S 后,用电器正常工作,交流电压表和交流电流表 ( 均为理想电表 ) 的示数分别为 220 V 和 2.2 A .以下判断正确的是 ( )
A.
．变压器输入功率为 484 W
B.
．通过原线圈的电流的有效值为 0.6 A
C.
．通过副线圈的电流的最大值为 2.2 A
D.
．变压器原、副线圈匝数比 n 1 ∶ n 2 ＝ 11 ∶ 3
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