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【单选题】
某理想变压器的原、副线圈按如图所示电路连接，图中电压表和电流表均为理想交流电表，R、R 1 、R 2 为定值电阻，且R 1 =R 2 ，交流电源的输入电压U 1 一定。电键S原来闭合，现将S断开，则电压表的示数U 2 、电流表的示数I、电阻R 1 上的功率P 1 、变压器原线圈的输入功率P的变化情况分别是（）A.
U 2 增大
B.
I增大
C.
P 1 增大
D.
P增大
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