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动态电路是以滑动变阻器的调节或开关的开闭为手段,引发电路结构或串、并联电阻的阻值发生变化的电路.动态电路的分析是各类考试的重点内容,重点考查对电路结构的判断,串、并联电路的规律的应用,电流表、电压表示数的变化等内容.虽然动态电路变化多端,但无外乎三种情况:开关控制电路、滑动变阻器控制电路、半导体电阻的阻值随环境的改变.下面就利用欧姆定律对这三类问题进行例析.一、开关的断开与闭合对电路的影响解决这个问题应该从电路的初始状态入手,分析由于开关的通断引发电路结构状态的变化.解题的一般步骤为:(1)明确开关状态改变之前的电路结构.
Dynamic circuit is a sliding rheostat regulation or switch on and off as a means to trigger the circuit structure or series, parallel resistance of the resistance value of the circuit changes. Dynamic circuit analysis is the focus of various examinations, focusing on the test of the circuit structure Judgment, the application of the law of series and parallel circuit, the ammeter, the change of the voltage exponent, etc. Although the dynamic circuit has many changes, it is nothing less than three situations: the switch control circuit, the sliding rheostat control circuit, the resistance value of the semiconductor resistor The change of environment.The following uses the Ohm’s law to carry on the analysis to these three kinds of questions.One, the switch opens and closes to the influence of the circuitTo solve this problem should start with the initial state of the circuit, analyze the circuit structure State changes. The general steps to solve the problem: (1) clear the switch state before the change of circuit structure.