高二闭合电路欧姆定律的题目如图所示,电源电动势为E,内阻为r.当开关S闭合,滑动变阻器的滑片P位于中点位置时,三个小灯泡都正常发光,且功率相同.已知滑动变阻器总电阻R是灯L1的电阻R1的2
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![高二闭合电路欧姆定律的题目如图所示,电源电动势为E,内阻为r.当开关S闭合,滑动变阻器的滑片P位于中点位置时,三个小灯泡都正常发光,且功率相同.已知滑动变阻器总电阻R是灯L1的电阻R1的2](/uploads/image/z/6207788-20-8.jpg?t=%E9%AB%98%E4%BA%8C%E9%97%AD%E5%90%88%E7%94%B5%E8%B7%AF%E6%AC%A7%E5%A7%86%E5%AE%9A%E5%BE%8B%E7%9A%84%E9%A2%98%E7%9B%AE%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8A%A8%E5%8A%BF%E4%B8%BAE%2C%E5%86%85%E9%98%BB%E4%B8%BAr.%E5%BD%93%E5%BC%80%E5%85%B3S%E9%97%AD%E5%90%88%2C%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%E7%9A%84%E6%BB%91%E7%89%87P%E4%BD%8D%E4%BA%8E%E4%B8%AD%E7%82%B9%E4%BD%8D%E7%BD%AE%E6%97%B6%2C%E4%B8%89%E4%B8%AA%E5%B0%8F%E7%81%AF%E6%B3%A1%E9%83%BD%E6%AD%A3%E5%B8%B8%E5%8F%91%E5%85%89%2C%E4%B8%94%E5%8A%9F%E7%8E%87%E7%9B%B8%E5%90%8C.%E5%B7%B2%E7%9F%A5%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%E6%80%BB%E7%94%B5%E9%98%BBR%E6%98%AF%E7%81%AFL1%E7%9A%84%E7%94%B5%E9%98%BBR1%E7%9A%842)
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