一只标有“6V 3W”的灯泡L与一只滑动变阻器R串联,开关S闭合后,电压表示数为18V,滑动变阻器的滑片P在a点时,灯泡正常发光.当滑片P从a点滑动到b点时,电路中的电阻增大了9Ω.求:⑴滑片P在a 点
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![一只标有“6V 3W”的灯泡L与一只滑动变阻器R串联,开关S闭合后,电压表示数为18V,滑动变阻器的滑片P在a点时,灯泡正常发光.当滑片P从a点滑动到b点时,电路中的电阻增大了9Ω.求:⑴滑片P在a 点](/uploads/image/z/12295917-45-7.jpg?t=%E4%B8%80%E5%8F%AA%E6%A0%87%E6%9C%89%E2%80%9C6V+3W%E2%80%9D%E7%9A%84%E7%81%AF%E6%B3%A1L%E4%B8%8E%E4%B8%80%E5%8F%AA%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8R%E4%B8%B2%E8%81%94%2C%E5%BC%80%E5%85%B3S%E9%97%AD%E5%90%88%E5%90%8E%2C%E7%94%B5%E5%8E%8B%E8%A1%A8%E7%A4%BA%E6%95%B0%E4%B8%BA18V%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%E5%9C%A8a%E7%82%B9%E6%97%B6%2C%E7%81%AF%E6%B3%A1%E6%AD%A3%E5%B8%B8%E5%8F%91%E5%85%89.%E5%BD%93%E6%BB%91%E7%89%87P%E4%BB%8Ea%E7%82%B9%E6%BB%91%E5%8A%A8%E5%88%B0b%E7%82%B9%E6%97%B6%2C%E7%94%B5%E8%B7%AF%E4%B8%AD%E7%9A%84%E7%94%B5%E9%98%BB%E5%A2%9E%E5%A4%A7%E4%BA%869%CE%A9.%E6%B1%82%EF%BC%9A%E2%91%B4%E6%BB%91%E7%89%87P%E5%9C%A8a+%E7%82%B9)
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