(09年长沙一中、雅礼中学联考)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Ll、L2、L3都正常发光,且亮度相同,则( )A.三个灯泡的额定电流
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![(09年长沙一中、雅礼中学联考)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Ll、L2、L3都正常发光,且亮度相同,则( )A.三个灯泡的额定电流](/uploads/image/z/10883387-11-7.jpg?t=%EF%BC%8809%E5%B9%B4%E9%95%BF%E6%B2%99%E4%B8%80%E4%B8%AD%E3%80%81%E9%9B%85%E7%A4%BC%E4%B8%AD%E5%AD%A6%E8%81%94%E8%80%83%EF%BC%89%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%A1Ll%E3%80%81L2%E3%80%81L3%E9%83%BD%E6%AD%A3%E5%B8%B8%E5%8F%91%E5%85%89%2C%E4%B8%94%E4%BA%AE%E5%BA%A6%E7%9B%B8%E5%90%8C%2C%E5%88%99%EF%BC%88+%EF%BC%89A.%E4%B8%89%E4%B8%AA%E7%81%AF%E6%B3%A1%E7%9A%84%E9%A2%9D%E5%AE%9A%E7%94%B5%E6%B5%81)
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