A和D对吗请陈述理由某同学在做“调节灯泡亮度”的电学实验中,电路如图所示,电源电压恒为4.5V,电压表量程“0~3V”,滑动变阻器规格为“20欧,1A”,灯泡标有“2.5V 1.25W”字样(忽略灯丝电阻变
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![A和D对吗请陈述理由某同学在做“调节灯泡亮度”的电学实验中,电路如图所示,电源电压恒为4.5V,电压表量程“0~3V”,滑动变阻器规格为“20欧,1A”,灯泡标有“2.5V 1.25W”字样(忽略灯丝电阻变](/uploads/image/z/7243334-62-4.jpg?t=A%E5%92%8CD%E5%AF%B9%E5%90%97%E8%AF%B7%E9%99%88%E8%BF%B0%E7%90%86%E7%94%B1%E6%9F%90%E5%90%8C%E5%AD%A6%E5%9C%A8%E5%81%9A%E2%80%9C%E8%B0%83%E8%8A%82%E7%81%AF%E6%B3%A1%E4%BA%AE%E5%BA%A6%E2%80%9D%E7%9A%84%E7%94%B5%E5%AD%A6%E5%AE%9E%E9%AA%8C%E4%B8%AD%2C%E7%94%B5%E8%B7%AF%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E6%81%92%E4%B8%BA4.5V%2C%E7%94%B5%E5%8E%8B%E8%A1%A8%E9%87%8F%E7%A8%8B%E2%80%9C0%7E3V%E2%80%9D%2C%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%E8%A7%84%E6%A0%BC%E4%B8%BA%E2%80%9C20%E6%AC%A7%2C1A%E2%80%9D%2C%E7%81%AF%E6%B3%A1%E6%A0%87%E6%9C%89%E2%80%9C2.5V+1.25W%E2%80%9D%E5%AD%97%E6%A0%B7%EF%BC%88%E5%BF%BD%E7%95%A5%E7%81%AF%E4%B8%9D%E7%94%B5%E9%98%BB%E5%8F%98)
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