如图11—18所示，M是理想变压器，<img src="http://www.weimei168.com/uploads/202208/20130108163627382738.jpg" alt="" border="0" />是交流电流表，<img src="http://www.weimei168.com/uploads/202208/20130108163624792479.jpg" alt="" border="0" />是交流电压表．当次级电路(副线圈)中的开关S合上时（　　）<br /> <img src="http://www.weimei168.com/uploads/202208/20130108163686538653.jpg" alt="" border="0" />