在考纲中,交变电流共4个考点,在高考中,理想变压器和远距离输电的曝光率相对较高,而且从近年高考命题内容看,年年是稳中有变,具体如下.一、理想变压器的定量计算【例1】(2015·广东卷)图1为气流加热装置的示意图,使用电阻丝加热导气管,视变压器为理想变压器,原线圈接入电压有效值恒定的交流电并保持匝数不变,调节触头P,使输出电压有效值由220V降至110V.调节前后() In the syllabus, a total of four alternating current test centers, college entrance examination, the ideal transformer and long-distance transmission of relatively high exposure, but also from the recent college entrance examination proposition content, steadily change every year, as follows. Figure 1 is a schematic diagram of the airflow heating device, the use of resistance heating wire, depending on the ideal transformer for the transformer, the coil connected to the AC voltage constant voltage and maintain the turn Number of constant, adjust the contact P, the RMS output voltage dropped from 220V to 110V. Adjust the front and rear ()