关键词: 虚拟仿真；电工电子技术；Multisim 软件；555 定时器

Abstract: The course of electrical and electronic technology involves many concepts and abstract contents, which is difficult in the actual teaching process. Students do not have a solid grasp of basic knowledge, plus the limitations of experimental conditions. Under the lack of experimental support, students' interest in learning is further reduced and the learning difficulty of the course is increased. Multisim software has the function of virtual simulation circuit analysis and has been applied in practical engineering. By introducing the virtual simulation software into classroom teaching, it can greatly improve the efficiency of teaching and experiment, and deepen students' understanding and application of basic electrical knowledge. Combined with the teaching case of 555 timer in automobile turn signal circuit, from parameter theoretical analysis to fault phenomenon simulation,this paper enables students to deeply understand a series of theoretical and practical knowledge, such as circuit principle creation, electrical parameter analysis, virtual oscilloscope use and so on. From the perspective of teaching effect, the introduction of simulation experiment can effectively enhance students' learning interest and lay a solid foundation for better learning the maintenance knowledge of automobile electrical system.

Key words: Virtual simulation; Electrical and electronic technology; Multisim software; 555 timer