在图6甲所示的电路中,当滑片P由b移到a的过程中,电压表示数U随滑

在图6甲所示的电路中,当滑片P由b移到a的过程中,电压表示数U随滑动变阻器接入电路的电阻R2的变化情况如图6乙所示。下列说法正确的是(  )

    A.电阻R1的阻值为20Ω

   B.滑片P移到b端时,R2两端的电压为6V

   C.滑片P移到a端时,R1消耗的功率为0.2W

     D.当滑片P移到中点时,通过R1的电流为0.3A

 


答案

D

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