A free program for Android, by Study Point.
This app provides a comprehensive coverage of the essential concepts and tools in the field of electrical engineering. It is suitable for all levels of learners, from those who are just beginning their studies to those who have already taken a course in this subject.
The content of this app is organized into different modules. Each module covers a different topic, such as voltage, current, energy, power, and more. In addition, each module includes a test that you can use to check your knowledge.
The app is very easy to use. Simply tap on the screen to access the different modules. You can then tap on the topic that you want to learn more about.