Abstract
This research The purpose is to study the effects of using STEM teaching methods and to compare the achievement of Science voltage. Between pretest and posttest received instruction STEM. The samples used in this study as a high school student 3rd year 2 Semester in 2558 Nain School District, Uttaradit Province with 28 people. Have come from the select sampling (Purposive Sampling) This research is experimental research. The research by One Group Pretest- Posttest Design. The instruments used in this study included 1) management plan STEM learning about Electrical voltage were 1 plan 2) achievement test. The statistics used in the analysis are: The arithmetic mean ,Per cent, Standard deviation, And the test statistic (t-test for Dependent Group). The results showed that students who learn to use teaching methods STEM. Before the study had an average of 7.321 and after the study had an average of 12.321 Achievement of students After studying the significant 0.01