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现行初中物理课本第二册p.177例题2:有一个电铃,它的电阻是10欧,在正常工作时它两端的电压应该是6伏.但是我们手边现有的电源电压是8伏,要把这个电铃接在这个电源上,需要给它串联一个多大的电阻? 按编者的意思,这道题的目的是为了阐明串联电路的特点:串联电路中各处的电流强度相等;串联电路的总电压等于各个导体两端的分电压之和.因此有如下的解: 解:画出电路图,如图所
The current junior middle school physics textbook volume 2 p.177 Example 2: There is a bell whose resistance is 10 ohms. In normal operation, the voltage across it should be 6 volts. However, the current power supply voltage at hand is 8 volts. To connect this bell to this power supply, what resistance should be connected in series? According to the editor’s intention, the purpose of this question is to clarify the characteristics of the series circuit: the current intensity in the series circuit is equal; the total number of series circuits The voltage is equal to the sum of the voltages at the two ends of each conductor. Therefore, there is the following solution: Solution: Draw the circuit diagram as shown in the figure.