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例题如图所示的是理想的自耦变压器,若a、b间匝数为40匝,b、c间匝数为160匝,输入电压为100V,电阻R上消耗的功率为10W,则交流电流表A的读数为
Example as shown in the figure is the ideal autotransformer, if the number of turns between a and b is 40 turns, the number of turns between b and c is 160 turns, the input voltage is 100V and the power consumed by resistor R is 10W. Ammeter A reading is