EFFECTS OF INQUIRY-BASED LEARNING MODEL ON STUDENTS LEARNING OUTCOMES IN TOPIC OF DYNAMICS ELECTRICITY IN GRADE X SMA N 2 BALIGE ACADEMIC YEAR 2012/2013

This study aims to constructs learning model by using inquiry-based learning model in topic dynamic electricity in secondary high school grade X and observe its effect on improving cognitive learning outcomes of studentsThe type of research is experimental research. The population is all students of class X SMA Negeri 2 Balige Academic Year 2012/2013, consist of 7 classes. The research done in May 2013. Two classes selected randomly as sample. One class as experiment class and another class as control class. Experiment class using Inquiry-based learning model and control class using conventional learning. Research data collected through students learning outcomes test in multiple choice. The test given twice, before and after treatment (pretest and postest). To test the hypothesis using test t, but previously must tested the normality and homogenity of the data. From the analysis of postest data in experiment class, for concept mastery obtained the average score is 83.59 with standard deviation 7.95, whereas the postest data in control class obtained that the average score is 75.67 with standard deviation is 10.73. From t-test for learning outcomes of pretest in both class obtained tcount < ttable, where tcount = 0.13 and ttable = 1.67. It means that the initial ability both of class is same. In the testing of hypothesis for postest, the criteria is: H0 is accepted if tcount < ttable and H0 is rejected if tcount has another score, where ttable obtained from list of distribution t. From the calculation of t-test for learning outcomes using &#945; = 0.05, obtained tcount = 3.79 and ttable = 1.67. This result show that the student