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近几年的中学生物理竞赛,特别是实验题目的命题均以综合性、普遍性和设计性强为特点。差值电压表的设计作为非平衡电桥的应用之一,它包括的内容较为广泛,有一定的难度,但作为物理竞赛的实验题目确有一定的意义。一、题目如图1,试将一个100μA的电流表表头改装成一个8～10V 的直流电压表。已知稳压二极管 D 的稳定电压是3.6V,稳压区电流范围是
In recent years, the physics competitions for middle school students, especially the subjects of the experimental subjects, have been characterized by comprehensiveness, universality, and strong design. The design of differential voltage meter is one of the applications of non-equilibrium bridges. It includes a wide range of content and has a certain degree of difficulty, but it has certain significance as an experimental subject of physical competition. First, the problem is shown in Figure 1. Try to convert a 100μA meter head into a 8-10V DC voltmeter. The steady voltage of the known zener diode D is 3.6V, and the current range of the voltage regulator zone is