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一个最大阻值为R_L的滑动变阻器与一个阻值为R_0的定值电阻串联在电压为U的电路中,如图所示,移动滑片使滑动变阻器消耗的电功率最大,则此时滑动变阻器消耗的
A sliding rheostat with a maximum resistance value of R_L is connected in series with a resistance value with a resistance of R_0 in a circuit with a voltage of U. As shown in the figure, moving the sliding vane maximizes the electric power consumed by the sliding rheostat, and then the sliding rheostat consumes of