题目内容
用伏安法测电阻RX时的电路如图甲、乙两种接法,若用甲图接法测量值为R1若用乙图接法测量值为R2,下面说法中正确的是( )
![](http://thumb.1010pic.com/pic3/upload/images/201406/149/433e93d5.png)
![](http://thumb.1010pic.com/pic3/upload/images/201406/149/433e93d5.png)
A、R2>RX>R1 | B、R2<RX<R1 | C、RX>R1RX>R2 | D、RX<R1RX<R2 |
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![](http://thumb.1010pic.com/pic3/upload/images/201406/236/2f498560.png)
A、甲表是电流表,R增大时量程增大 | B、甲表是电流表,R增大时量程减小 | C、乙表是电压表,R增大时量程减小 | D、乙表是电压表,R增大时量程增大 |
用伏安法测电阻时有如图所示的甲、乙两种接法,下面说法中正确的是( )
![](http://thumb.1010pic.com/pic3/upload/images/201406/163/7c53e259.png)
![](http://thumb.1010pic.com/pic3/upload/images/201406/163/7c53e259.png)
A、当Rx<<RV时,用甲种接法误差较小,当Rx>>RA时,用乙种接法误差较小 | B、当Rx>>RA时,用甲种接法误差较小,当Rx<<RV时,用乙种接法误差较小 | C、甲电路测量电阻结果总是偏大,乙电路测量电阻结果总是偏小 | D、两种电路测量结果的平均值更接近真实值 |
用伏安法测一未知电阻Rx,用甲图和乙图两种连接方式.( )
![](http://thumb.1010pic.com/pic3/upload/images/201407/56/57e6197f.png)
![](http://thumb.1010pic.com/pic3/upload/images/201407/56/57e6197f.png)
A、甲图所示的接法测量值小于真实值 | B、乙图所示的接法测量值大于真实值 | C、甲图所示的接法测量值大于真实值 | D、乙图所示的接法测量值小于真实值 |
![](http://thumb.1010pic.com/pic3/upload/images/201406/158/bf763715.png)
A、R测=R | ||
B、R测=R+R1 | ||
C、R测=R-R1 | ||
D、R测=
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