(8分)如图所示电路图中,小灯泡L上标有“8V 3.2W”字样,滑动变阻

(8分)如图所示电路图中,小灯泡L上标有“8V 3.2W”字样,滑动变阻器的最大值为40欧,R1的阻值为18欧,求:

①小灯泡L的电阻

②S、S1、S2均闭合时,电压表的示数为9伏,

求电源电压及电阻R1上消耗的电功率

③断开S1、S2,闭合S,若接入电路中的电压表的量程改

为0-3伏,电流表的量程为0-0.6安,为了保证两表均不

超过量程,且小灯泡两端的电压不超过其额定电压,滑动变阻器的阻值变化范围为多少?

 

 

 

答案

①20欧;②9V,4.5w;③2.5欧~10欧

 

 解析:略

 

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