2011卢湾区初三物理二模22题第三问电源电压为18伏且保持不变,滑动变阻器R2上标有“50Ω 2A”字样.闭合电键S(串联电路,一个电阻和一变阻器,电压表接在变阻器两端)③现用定值电阻R0来替换

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