电桥灵敏度与检流计内阻关系的分析  

Analysis of Relationship Between Sensitivity of Wheatstone Bridge and Internal Resistance of Galvanometer

作　　者：周慕 王杭秋 尹会听[1] 

机构地区：[1]浙江海洋学院,浙江舟山316000

出　　处：《绿色科技》2014年第10期235-236,共2页Journal of Green Science and Technology

摘　　要：指出了在自搭式惠斯通电桥实验中,检流计内阻是电桥灵敏度一个重要影响因素。首先从理论上推导出了电桥灵敏度与检流计内阻关系式,然后在实验中取检流计内阻不同值进行了分析,结果表明：检流计内阻Rg远远大于其他桥臂电阻时,电桥灵敏度很低,Rg在0~5000Ω范围中,随着Rg减小,电桥灵敏度会增加明显。In the Wheatstone bridge experiment, internal resistance of galvanometer is an important factor which affects the sensitivity of bridge. Firstly, the article deduces theoretically the relationship between sensitivity of Wheatstone bridge and internal resistance of galvanometer. Then the article analyzes the relationship by taking different values of internal resistance of galvanometer in the experiment, and the results show that when the internal resistance of galvanometer Rg is much larger than the arm resistance of other bridge, sensitivity of bridge is very low. If RN is in the range of 0~5000~, the sensitivity of bridge increases significantly as the RN decreases.

关 键 词：惠斯通电桥 灵敏度 检流计内阻 

分 类 号：O441.1[理学—电磁学]