本文在理论上从灵敏度的定义以及能量观点对直流单臂电桥(惠斯登电桥)的灵敏度作了论证。证明了该电桥不存在灵敏度最大的工作状态,并指出了等臂电桥并非在任何情况下灵敏度都高。以上两点笔者与有关文献的结论不同,最后对实验中的作法作了理论上的解释。 In this paper, the sensitivity of DC single-arm bridge (Wheatstone bridge) is theoretically demonstrated from the definition of sensitivity and energy point of view. It is proved that the bridge does not have the most sensitive working condition and points out that the arm bridge is not sensitive under all circumstances. The above two points different from the conclusions of the relevant literature, and finally the practice of the experiment made a theoretical explanation.