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闭合电路中某一电阻发生变化时,电路中通过各用电器的电流、两端的电压及消耗的功率等会发生变化。这一变化常用“并同串反”来判断。随着素质教育推进,由单一电阻变化的电路变为两个电阻同时变化的电路。两个电阻同时变化时的电路有两种,下面通过举例说明这两种动态电路特殊判断方法。例1.如图1,电源内阻不计,当滑动变阻器R1的滑片p从a
When a certain resistance in the closed circuit changes, the current through each appliance in the circuit changes, the voltage at both ends and the power consumed will change. This change is commonly used “and the same string ” to judge. With the promotion of quality education, the circuit that changes from a single resistance to two circuits whose resistance changes at the same time. There are two kinds of circuits when two resistors change at the same time. The following two methods are used to illustrate the special judgment methods of these two kinds of dynamic circuits. Example 1. As shown in Fig. 1, the internal resistance of the power supply is not counted. When the sliding vane of sliding rheostat R1 p from a