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一、问题的提出我省2012届高三年级第二次全省统一测试中,有这样一道选择题,原题如下:如图1所示,理想变压器原线圈接电压有效值可视为恒定的正弦式交流电源,副线圈接负载电阻R1、R2,电路中其余电阻均不计,各电表均为理想电表,S1、S2闭合,各电表均有示数。下列分析正确的是()A.保持S1闭合,断开S2,电压表V示数增大B.保持S1闭合,断开S2,电流表A1、A2示数均减小
First, the problem raised In 2012 the third year of high school in our province the second time the province unified test, there is such a multiple choice, the original title is as follows: As shown in Figure 1, the ideal transformer primary coil voltage RMS can be regarded as a constant sine AC power supply, the secondary coil connected to the load resistance R1, R2, the remaining resistance in the circuit are not counted, the meter are ideal meter, S1, S2 closed, the meter shows the number. The following analysis is correct () A. Keep S1 closed, open S2, voltmeter V shows increased B. Keep S1 closed, disconnect S2, Ammeter A1, A2 were reduced