This research aims to determine the feasibility and effectivity of mobile learning based Worked Example in Electric Circuits (WEIEC) application in improving the high school students' electric circuits interpretation ability on Direct Current Circuits materials. The research method used was a combination of Four-D Models and ADDIE model. The research design used was a pretest-posttest control group design using quantitative approach. The data collection instruments in this research were non-test and test instruments. The non-test instruments consist of product feasibility instrument, materials feasibility instrument, and preliminary field testing instrument. The test instruments were the pretest and post test data. The data analysis technique used was Aiken's V to assess the product quality of the WEIEC application and General Linear Model (GLM) Mixed Design test to determine the students' electric circuit interpretation ability improvement. The research subject were 9 experts judgement, 35 senior high school students of class XII for the preliminary field testing and 74 students for the main field testing. Research results showed that the developed WEIEC Application was considered feasible to use in terms of materials aspect assessment with the Aiken's V score of 0.80, media aspect with the Aiken's V score of 0.80 and preliminary field testing results on the students with the Aiken's V score of 0.81. The developed WEIEC application could improve the electric circuit interpretation ability based on the Mean Difference (MD) score of -28,811 with 85.8% effectivity based on Partial Eta Squared in Multivariate Test.