如图所示电路,电压U保持不变,三个电阻的阻值R1=R2=R3=10Ω.若将一只电流表并联在R2的两端,其示数为1.5A,据此可知电压U=______V:若用一只电压表替代电流表并联在R2两端,则电压表的示数为_______V.
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![如图所示电路,电压U保持不变,三个电阻的阻值R1=R2=R3=10Ω.若将一只电流表并联在R2的两端,其示数为1.5A,据此可知电压U=______V:若用一只电压表替代电流表并联在R2两端,则电压表的示数为_______V.](/uploads/image/z/5302556-44-6.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%94%B5%E8%B7%AF%2C%E7%94%B5%E5%8E%8BU%E4%BF%9D%E6%8C%81%E4%B8%8D%E5%8F%98%2C%E4%B8%89%E4%B8%AA%E7%94%B5%E9%98%BB%E7%9A%84%E9%98%BB%E5%80%BCR1%3DR2%3DR3%3D10%CE%A9.%E8%8B%A5%E5%B0%86%E4%B8%80%E5%8F%AA%E7%94%B5%E6%B5%81%E8%A1%A8%E5%B9%B6%E8%81%94%E5%9C%A8R2%E7%9A%84%E4%B8%A4%E7%AB%AF%2C%E5%85%B6%E7%A4%BA%E6%95%B0%E4%B8%BA1.5A%2C%E6%8D%AE%E6%AD%A4%E5%8F%AF%E7%9F%A5%E7%94%B5%E5%8E%8BU%3D______V%EF%BC%9A%E8%8B%A5%E7%94%A8%E4%B8%80%E5%8F%AA%E7%94%B5%E5%8E%8B%E8%A1%A8%E6%9B%BF%E4%BB%A3%E7%94%B5%E6%B5%81%E8%A1%A8%E5%B9%B6%E8%81%94%E5%9C%A8R2%E4%B8%A4%E7%AB%AF%2C%E5%88%99%E7%94%B5%E5%8E%8B%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA_______V.)
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