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一、明确直流电路动态变化的原因1.由于滑动变阻器的滑片移动(或电阻箱的旋钮旋转)改变了电路中的电阻.2.开关的通断导致了电路结构的变化,从而改变了电路的总电阻.开关在电路中起两个作用,一是起接通或切断整个电路或一部分电路的作用.二是起改变电路结构的作用.尤其是单刀双掷开关与双刀双
First, determine the reasons for the dynamic changes of the DC circuit 1. As the slider of the sliding rheostat moves (or the knob of the resistor box rotates), the resistance in the circuit is changed. 2. The on/off of the switch leads to the change of the circuit structure, thus changing the circuit. The total resistance of the switch. The switch plays two roles in the circuit, one is to turn on or cut off the entire circuit or part of the circuit. The second is to change the circuit structure. Especially the single pole double throw switch and double pole double