The main objective of this study was to develop a mobile application that can be utilized to aid the teaching-learning process in the subject Electrical Installation and maintenance. The descriptive-correlation design was used together with the validated questionnaire for data gathering. After the utilization of the developed mobile application on to the students, questionnaires are then given to them to evaluate the application. The data gathered was tabulated, and analyzed using Microsoft Excel and Minitab 14 for data processing. Results showed that the level of acceptability of the components of the developed mobile application in terms of content (M=4.71), activities (M=4,59), and assessment (M=4.70) were all regarded very high, except for reflection (M=3.67) which was only regarded with an interpretation of high. For the level of acceptability of the features of the developed mobile application in terms of design (M=4.61), connection to curriculum (M=4.69), and multimedia quality (4.66) are all interpreted as very high.  As for the respondents level of achievement of competencies in terms of both technical skills (M=92.50) and work attitude (M=96.88), both interpreted have developed an outstanding performance, except for cognitive (M=86.75), which has a very satisfactory level.  This research also proved that the components of the mobile application have an implication on attainment of the desired competencies for the learners which was manifested in their written and performance task and their attitude towards work. Also, the features of the developed mobile application showed a significant effect towards the achievement of the mobile application users, except for the factor about design. This implies further that the design of the mobile application may be enhanced to influence students attainment of the desired competencies. .               Therefore, it can be concluded that the high level of acceptability of the components of the developed mobile application contributes to the very satisfactory and outstanding level of achievement of the learners.  Also, it can be concluded that the features of the mobile application, in terms of connection to the curriculum and multimedia quality impacts the achievement of the students.

Activities; assessment; competencies; connection to curriculum; content; design; electrical installation and maintenance; mobile application; multimedia quality; reflection; technical skills; work att