如图所示电路,电源电压恒定,当滑动变阻器的滑片P位于变阻器的中点时,闭合开关S,甲、乙两灯亮度相同.若将滑片向上移动,则:A.甲灯变亮,乙灯变暗 B.乙灯变亮,甲灯变暗C.甲、乙两灯都变亮 D
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![如图所示电路,电源电压恒定,当滑动变阻器的滑片P位于变阻器的中点时,闭合开关S,甲、乙两灯亮度相同.若将滑片向上移动,则:A.甲灯变亮,乙灯变暗 B.乙灯变亮,甲灯变暗C.甲、乙两灯都变亮 D](/uploads/image/z/3171104-8-4.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%94%B5%E8%B7%AF%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E6%81%92%E5%AE%9A%2C%E5%BD%93%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%E5%8F%98%E9%98%BB%E5%99%A8%E7%9A%84%E4%B8%AD%E7%82%B9%E6%97%B6%2C%E9%97%AD%E5%90%88%E5%BC%80%E5%85%B3S%2C%E7%94%B2%E3%80%81%E4%B9%99%E4%B8%A4%E7%81%AF%E4%BA%AE%E5%BA%A6%E7%9B%B8%E5%90%8C.%E8%8B%A5%E5%B0%86%E6%BB%91%E7%89%87%E5%90%91%E4%B8%8A%E7%A7%BB%E5%8A%A8%2C%E5%88%99%EF%BC%9AA.%E7%94%B2%E7%81%AF%E5%8F%98%E4%BA%AE%2C%E4%B9%99%E7%81%AF%E5%8F%98%E6%9A%97+B.%E4%B9%99%E7%81%AF%E5%8F%98%E4%BA%AE%2C%E7%94%B2%E7%81%AF%E5%8F%98%E6%9A%97C.%E7%94%B2%E3%80%81%E4%B9%99%E4%B8%A4%E7%81%AF%E9%83%BD%E5%8F%98%E4%BA%AE+D)
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