如图所示电路图中,R1=R2=4欧,R3=3欧,R4=6欧,安培表的电阻不计,当

如图所示电路图中,R1=R2=4欧,R3=3欧,R4=6欧,安培表的电阻不计,当K接通时,安培表的示数为多少?(AB另端电压为12)

答案

0.5A 

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