如图所示,,小灯泡L标有“6V,3W”字样,滑动变阻器R1的最大电阻

如图所示,,小灯泡L标有“6V3W”字样,滑动变阻器R1的最大电阻为

1)当1S2都断开时,调节滑动变阻器使小灯泡正常发光,这时滑动变阻器连入电路的阻值为,求:

① 小灯泡的电阻?

② 电压表的示数?

2)当开关S1S2都闭合时,说明电路连接情况,求电路消耗的最小电功率?

答案

1RL=12   U=14V    2L被短接,并联   P=4.1W

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