高中物理教材(新教材)对多用电表的使用要求较高,但没有涉及欧姆表的原理问题.由于多用电表欧姆挡的挡间变换的原理较复杂,学生不易理解,部分教师对此问题也有不少疑问.例如,当欧姆表由小倍率挡变大倍率挡时内阻变大了还是变小了? 表内仅仅是通过调零电阻来实现电阻变化的 High school physics textbook (new textbook) on the use of multi-meter higher, but not related to the ohm meter principle problems. Because multi-meter ohm block between the shift principle is more complex, students do not understand, some teachers also have this problem For example, when the ohm meter block from a small rate of large-scale block change larger or smaller internal resistance? Table is only through the zero resistance to achieve resistance changes