如图所示,小灯泡标有“6V,3W”字样如图所示,小灯泡标有“6V,3W”字样,电源电压不变,当滑动变阻器连入电路的电阻为4Ω时,灯泡恰好正常发光.(1)求电源电压是多大?(2)改变滑动变阻器滑片
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![如图所示,小灯泡标有“6V,3W”字样如图所示,小灯泡标有“6V,3W”字样,电源电压不变,当滑动变阻器连入电路的电阻为4Ω时,灯泡恰好正常发光.(1)求电源电压是多大?(2)改变滑动变阻器滑片](/uploads/image/z/7932375-63-5.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%B0%8F%E7%81%AF%E6%B3%A1%E6%A0%87%E6%9C%89%E2%80%9C6V%2C3W%E2%80%9D%E5%AD%97%E6%A0%B7%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%B0%8F%E7%81%AF%E6%B3%A1%E6%A0%87%E6%9C%89%E2%80%9C6V%2C3W%E2%80%9D%E5%AD%97%E6%A0%B7%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E4%B8%8D%E5%8F%98%2C%E5%BD%93%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%E8%BF%9E%E5%85%A5%E7%94%B5%E8%B7%AF%E7%9A%84%E7%94%B5%E9%98%BB%E4%B8%BA4%CE%A9%E6%97%B6%2C%E7%81%AF%E6%B3%A1%E6%81%B0%E5%A5%BD%E6%AD%A3%E5%B8%B8%E5%8F%91%E5%85%89.%EF%BC%881%EF%BC%89%E6%B1%82%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E6%98%AF%E5%A4%9A%E5%A4%A7%3F%EF%BC%882%EF%BC%89%E6%94%B9%E5%8F%98%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%E6%BB%91%E7%89%87)
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