如图为冬冬实验时所用电路，电路中电流表的量程为0~~0.6A_优题课试题网

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更新 2022-09-03
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如图为冬冬实验时所用电路，电路中电流表的量程为0~~0.6A，电压表的量程为0~ 3V，滑动变阻器的最大值为50Ω，定值电阻R₀为10Ω，电源电压为6V且保持不变，实验时操作正确并保证电路各元件安全，则在闭合开关后，移动滑片P的过程中（）

A．电流表最小示数是0.3 A

B．滑动变阻器允许接入的最大电阻是10Ω

C．电路消耗的最小功率是1.5W

D．R₀消耗的最大功率是3.8W

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