In high school circuit teaching, issues such as the maximum power output of a power source, the analysis of dynamic circuits, and the analysis of transient circuits are difficult to teach. Traditional teaching methods are relatively abstract due to the lack of specific demonstration of the process where physical quantity changes lead to changes in circuit parameters, making it difficult for students to understand and grasp. This paper utilizes LTspice simulation software to construct circuit models with adjustable parameters, achieving dynamic simulation of these circuits from steady state to transient state, visually presenting the circuit change process. This intuitively enhances students’ comprehension and improves teaching effectiveness. The application of simulation software is also conducive to the cultivation of top-notch innovative talents.

As an important internal structure of a super magnetostrictive transducer, the resistance loss caused by the eddy current effect in the working state of multi-coil cannot be ignored. The mechanism of eddy current loss of single-core and multi-core coils is not the same. The resistance loss of single-core coils is mainly dominated by the skin effect, while the resistance loss of multi-core coils is influenced by both the skin effect and the proximity effect. In this paper, based on Maxwell's equations and eddy current effect, the analytical calculation formula of the resistance loss of single-core and multi-core coils is derived, and the finite element method is used to study the loss of single-core and multi-core coils under different ultrasonic frequency bands under the same current and the same cross-sectional area, and finally based on the principle of pure resistance of the circuit in the resonant state of RLC series circuit, the AC resistance of single-core and multi-core coils is measured, and the eddy current loss of the coil is obtained by combining the calculation formula of the loss power. The experimental results are consistent with the simulation results and analytical calculation results, verifying the effectiveness of the analytical calculation formula and experimental method for coil power loss.