摘要
金属丝在拉伸力的作用下长度会发生微小变化,金属丝长度的微小变化会使其电阻同时发生微小改变,利用双臂电桥测量低阻值电阻的原理测金属丝电阻的微小变化量,再通过相应的公式求得被测金属丝的杨氏模量,该方法简便,测量准确.
The length of metal wire changes under the action of tensile force, the tiny changes of the metal wire length makes its resistance tiny changes at the same time. Using the principle for double bridge measuring low Ohm value resistance to measure the tiny variation of metal wire resistance, we calculate the Young＇s modulus of metal wire by using the corresponding formula, This method is simple and accurate.
出处
《大学物理》
北大核心
2014年第4期18-21,共4页
College Physics
关键词
杨氏模量
双臂电桥
Yang＇s modulus
double bridge
