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The objectives of this research were 1) to develop the Electrical Circuit Training Package of Split Type Air Conditioning on refrigeration and air conditioning subject. 2) to find out the efficiency of electrical circuit training sets on refrigeration and air conditioning 3) to study the satisfactions of students to electrical circuit training set on refrigeration and air conditioning. Research tools consists of an electrical circuit training set of modular air conditioners handbook of practical work, achievement test, evaluation satisfaction forms. Sample group of the research was the 20 students in the second year of the regular military vaccination program in the electrical program for the academic year 2019. Data were analyzed using percentage, mean, standard deviation and t-test. The results of this research found that 1) develop the electrical training set of modular air conditioners on refrigeration and air conditioning through suitability assessment from 6 experts is at a very good level. ( = 4.69, S.D. = 0.04) (2) The result of the efficiency of the electrical circuit skills training kit for split air conditioners The average score is 78.89 / 79.78, which is 75 / 75 higher than the set criteria, and comparing the differences between the scores obtained before and after studying, the differences are statistically significant at the .01 level, 3) Students were satisfied with the use of the electrical circuit skill set of modular air conditioners at a high level overall (= 4.39, S.D. = 0.23)
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