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在电学实验中有不少仪器同时有“粗调”和“微调”两个调节旋钮,通常交替使用,用“粗调”定大致数值,“微调”定精确值.实际上我们调节的是两个滑动变阻器,其中一个总阻值很小,另一个总阻值很大.将它们的滑片移动相同的距离△χ,最大阻值大的滑动变阻器(下用R_(10))有效电阻的改变量较大,最大阻值小的(下用R_(20))有效电阻的改变量也较小.最大阻值不同的滑动变阻器,滑片每移动1圈(△χ不同)改变的有效阻值△R_0虽不一定相同,但都非常小,为了讨
In the electrical experiment, many instruments have both “coarse” and “fine” adjustment knobs, which are usually used interchangeably. The approximate value is set with “coarse adjustment ” and the value of “fine adjustment” . In fact, we adjust the two sliding rheostats, one of the total resistance is very small, the other a great total resistance. Slide their vane the same distance △ χ, the largest resistance of the sliding rheostat (10), the change of the effective resistance is larger, and the change of the maximum resistance (lower by R_ (20)) is smaller.Each sliding rheostat with different maximum resistance, △ χ different) to change the effective resistance △ R_0 Although not necessarily the same, but are very small, in order to discuss