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The transistor is the core component of the amplifying circuit. It can control the conversion of energy and amplify any small changes in the input without distortion. In the Multisim simulation environment, this article verifies the static operating point, voltage amplification and other performance parameters of the single-tube amplifier circuit according to the given circuit, and observes the nonlinear distortion phenomenon of the amplifier circuit.

Automotive electrical equipment can be summarized into three major components: power supply system, electrical equipment, and intermediate devices. For any electrical equipment and electronic control device to obtain power supply, the connection of intermediate devices is essential. The generator is the main power source of the car, and its function is to supply power to all electrical equipment (except the starter) when the engine is running normally (above idle speed), and to charge the battery at the same time. In this paper, by modeling the circuit of low-voltage electrical system of trams and designing and realizing the circuit model of low-voltage electrical system, this article masters the basic knowledge of circuit analysis, is familiar with the general process of circuit design, and can solve the general circuit faults in debugging.

Electrical engineering and electronics is a professional basic course that is just involved for students. It has many teaching contents and is difficult to learn. Moreover, the course develops rapidly and is widely used. In the teaching process, it shows strong conceptuality, many theories, and flexible circuit changes. It is difficult to understand, difficult to remember and difficult to learn. The traditional teaching model can no longer meet the demand, and the teaching model needs to be reformed urgently. This article takes the design of a digital electronic clock that is closely connected to real life as the subject task. The teacher puts forward the requirements. By training students to consult materials, discuss with classmates, design circuits, error correction and rectification, and simulation, the learning process is deepened. The knowledge and understanding of the theoretical knowledge of the circuit part have tested the students’ ability to apply what they have learned in the classroom to practice, which has improved the students’ interest in learning and the ability to think independently, laying a good foundation for cultivating students’ ability to learn for life.

Engineering education model of CDIO is the latest achievement of international engineering education reform. CDIO focus on cultivating the engineering consciousness of the students.It is a major challenge to achieve the complete class teching in so less class hour casued by the adujusting of the professional talent cultivating plan. This paper introduces education reform of electrical engineering and electronics based on CDIO. It takes the three-person answering circuit as an example to design the teaching mode of CDIO.

Power factor depends on the circuit parameters. Too low power factor will cause a series of problems, so it is important for the development of the national economy to improve the power factor of the power grid. In this paper, the method of improving power factor is designed and verified by Multisim simulation software. It will be great help to understand the method and significance of improving power factor.

It is important to select the correct diffusion model to predict the leakage concentrate of hazardous materials according to their molecular weight properties. Generally speaking, the Gauss diffusion model is usually used for predict light gas diffusion and SLAB model for weight gas. However diffusion model selection is also determined by storage condition, which can greatly change the physical condition and influence predictive model selection. In paper, we took liquid ammonia as an example. Ammonia is gaseous in normal temperature and pressure, and usually be converted into liquid by high pressure storage condition in practice. The gauss model and LSAB model were used in this paper to compare the difference of diffusion process. The result is as follows. For one thing, the spatial dimension predicted by Gauss model was greatly less than that of SLAB model accompanied by much wide spatial range in horizon direction to the predominant wind direction. For another, referencing to AEGL-1 standard, the longest diffusion distance in 4650s by SLAB model is about 6132 meters and the result predicted by Gauss model is about 2880 meters. The difference of influence spatial scope and diffusion distance predicted by two models is 44.7% and 77.2%. So it should be cautious when selecting diffusion model to predict the hazardous material leakage.