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【单选题】
如图所示电路中,电源电动势 ε=12V,内阻r=1Ω,此时电阻R 1 =5Ω,R 2 =2Ω,则( )A.
电键 K断开时，A、B两端电压小于12V
B.
电键 K闭合,电容器C充电后，电容器两极板间的电压等于10V
C.
电键 K闭合,若将变阻箱R 1 调大，则电容器 C所带的电量将变少
D.
电键K闭合, 若将变阻箱R 1 调为2Ω，则电源的输出功率最大
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