“电路的动态变化”是指电路中的局部电路发生变化时会引起电路中各部分电学量发生变化,如电路中电流、电压、功率等发生变化。变化的起因是电路中滑动变阻器滑片的滑动或某个开关的闭合与断开等。这一知识点涉及欧姆定律、串联和并联电路的特点等重要的电学知识,能很好地考查同学们分析问题和解决问题的能力,所以它是恒定电流的重 “Dynamic change of circuit ” refers to the change of local circuit in the circuit will cause the electrical quantity of each part in the circuit to change, such as the change of current, voltage and power in the circuit. The cause of the change is the sliding of the varistor slider in the circuit or the closing and opening of a switch. This knowledge point relates to Ohm’s law, the characteristics of series and parallel circuits and other important electrical knowledge, can be a good test of students’ ability to analyze and solve problems, so it is a constant current weight