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This study is aimed to assess student's and subject teacher’s needs in the learning process, to develop an interactive electronic physics source material in energy resources, and to grow critical thinking skills for the 12th grader of Senior High School. This study consists of four procedural steps: Problem identification, data sampling, product design, and design validation. The result of need assessment was obtained from 71 Senior High School students and Physics Teachers from several schools in Bandar Lampung. The result of the questionnaires as a data sampling technique was analyzed in quantitative and descriptive methods. The result shows that a physics textbook as a learning source material hasn’t been optimally functioned to grow self-confidence to overcome National Examination. On the other hand, the teacher requires Physics source material, which facilitates the learning process with the scientific approach, can improve critical thinking skills, and possible to be conducted in self-directed learning. The validation test results indicate that the type of source material that can accommodate 12th-grade students and physics teachers is an interactive electronic book that contains feedback. Stimulate activities in understanding concepts through images, animation. And finally complete with examples of problems and competency tests to improve students' conceptual understanding.

Interactive Physics E-Book Design of Energy Resources to Optimize Self-Directed Learning and Critical Thinking Skill