题目:
如图电路,电源电压保持12V不变,标有“10V 4W”的灯泡L与滑动变阻器R串联接在电路中.闭合S,调节滑片P使灯泡L正常发光,此时灯泡L的电阻为多少?电路中的电流为多少?通电2min,变阻器R上产生的热量为多少?
答案:
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