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电压表和电流表是测量电路中电压和电流的仪器,当电路中的某些开关或滑动变阻器的滑片移动时,均会造成电路中某些用电器两端的电压和电流改变,解决这类问题,如果分
Voltmeters and ammeters are instruments that measure the voltage and current in a circuit. When some switches in the circuit or the slides of a sliding rheostat move, they can cause changes in the voltage and current at both ends of some consumers in the circuit. If points