The purposes of the research were to create computer assisted instruction for Electric Power System Analysis Chapter 1-2 to find out the efficiency validation of computer assisted instruction based on the standard of 90/90 and to analyse the students learning achievement after using the computer assisted instruction. The subjects in the study were 17 third-year diploma engineering students enrolling at Rajamangala University of Technology Phra Nakhon. The researcher made the experiment by having the students pretest. Then they studied by using the computer assisted instruction focused on practicing basic turning. After the students had studied and had posttest the efficiency of the computer assisted instruction was calculated as well as the learning achievement was analysed. The research result revealed that the efficiency of the computer assisted instruction was at the standard of 90 / 90. Moreover the learning achievement after using the computer assisted instruction was different at the significant level of 0.05.

This project is the study about making the electrical voltage setting 0 – 220 Volts by software system with electrical voltage control of the auto transformer while it has 100 kv 10 kVA Especially the electrical voltage control has 65 ampares 0-220 volt 1 phase 50 Hz By the application of Visual Basic version 6 to the software and then use the micro controller in the board to control the stepper motor by setting the core of the auto transformer in the set of pattern while a computer is setting far away from the electrical High Voltage control and then it will apply the measurement system to the monitor display of software process system for development of software to the electrical Voltage section in the Electrical High voltage Lab to safety the danger of the test.