Development of a 3-phase motor control circuit experiments set for undergraduate students of 2nd year in industrial technology program; major of electrical technology

The objective of this research is 1) to develop the 3-phese motor control circuit experiments set 2) to study the performance of the experiments set 3) to compare critical thinking skills before and after learning from the 3-phase motors control circuit experiments set.  The sample in this research were selected by random placement (purposive sampling are 18 students in 2nd year undergraduate student who enrolled in EET 104 Electrical and Electronics Technology Workshop III in the 2nd semester of the academic year 2564 in industrial technology program: major of electrical technology, King Mongkut's University of Technology Thonburi.   The research tools in this study are 1) the worksheet for 3-phase motors control (6 worksheets) 2) the 3-phase motor control experiments set 3) the exercise to measure a learning achievement of the students who using the 3-phase motor experiments set in 4 type multiple-choise and 20 items.  The results showed that: 1) the efficacy of the 3-phese motor experiments set show the average score of an experiments set (E1 / E2) is equal to 85.56 / 82.22, which is the standard criteria of 80/80 2) to compare critical thinking skills before and after learning from the 3-phase motor control circuits found that the students 'critical thinking skills through' learning by the experiments set after learning are higher than before learning by statistically significant at the 0.01 level, which is based on assumptions.