The purpose of this research is to find out the comparison of Inquiry and Problem Based Learning learning models on critical thinking skills in terms of students' learning interests. This research was conducted at SMP Negeri 5 Sandai. This research was a quantitative experiment with the type of quasi-experimental design (quasi-experimental) research. The design of this study followed the research paradigm flow of Randomized Only Control Group Design where the subjects taken were grouped into two groups, namely experiment I and experimental group II. In this study, the samples were VIII grade students consisting of VIII A and VIII B classes. Experimental class 1, VIII A consisted of 30 students and experimental class 2, VIII B consisted of 30 students. The data collection tools used in this study were response questionnaires and tests of critical thinking skills in the form of essay questions. The results of the analysis of variance of the two cell paths are not the same indicating that there are differences in critical thinking skills between students with high, medium and low interest in learning. Based on the post-anava test with the Scheffe method, the value of F_(.1-.2) = 0.7374; F_(.1-.3) = 6.7540; F_(.2-.3) = 1.4279; DK = {F?F<3.168}. From the results of the calculation of the two-way analysis of variance with unequal cells, the value of F_ab=1.576<F_(0.05;2;54)=3.16 means that H_0AB is accepted so that there is no interaction between the learning model and learning interest on students' critical thinking skills.

<p><em>A power transformer is electrical power equipment that works to transmit power or electrical power from high voltage to low voltage or on the contrary. In the operation of distributing electricity, the transformer can be said to be the heart of transmission and distribution. In this condition, a transformer is expected to operate optimally according to its function.. If the isolation state of the transformer deteriorates, it can have an impact on operating failure and the most fatal of which is that the transformer is damaged which can cause disturbances in the electrical system. To overcome this, it is necessary to analyze the isolation resistance.</em></p><p><em>This study analyzes the isolation resistance on a transformer using the polarization index, tangent delta and oil breakdown voltage methods to determine the quality of the isolation on the transformer. This study took data at the 150 Kv substation Tegal. The data used include polarization index test data, tangent delta data, bottom oil breakdown voltage test data, and OLTC oil. After the data is obtained, then calculations and analyzes are carried out to obtain accurate results.</em></p><p><em>The test results at the 150 Kv substation Tegal showed the polarization index value with the lowest IP of 1.26 in the primary-ground section and the highest IP of 1.97 in the primary-secondary section is still in good condition. The results of the tangent delta test are still in good condition, only in the CHT mode experienced a negative delta tan deterioration of 0.07%. The result of the average oil test is still suitable for use with 69.9 Kv of bottom oil and 53.3 Kv of OLTC oil.</em></p>