This study aims to determine the effectiveness of the implementation of online learning on dynamic electricity topics carried out in junior high schools during the Covid-19 pandemic. Effectiveness is seen from the completeness of learning outcomes, obstacles faced during learning, and student responses to online learning. The research method used in this research is quantitative descriptive with one group pre-test post-test design. The sample used in this study were 64 junior high school students in one of the state junior high schools in Lamongan Regency, East Java. The results of the research obtained were that the average completeness of student learning on dynamic electricity material with an online learning model was very low (below the minimum completeness standards), analysis of the N-Gain value gets a value of 0.23 and is categorized as low. Statistical analysis with the help of SPSS 22 shows that the sample is normally distributed and hypothesis testing shows that online learning has no effect on increasing the value of student learning outcomes. There were many obstacles during the online learning process even though solutions had been given but there were not resolved properly, one of the obstacles was the need real lab. Student response to online learning is quite positive 63%. The conclusion of this study is that online learning is not effective enough to be used at the junior high school level and improvements are still needed in terms of facilities and infrastructure.

Online Learning Implementation, Dynamic Electricity, Covid-19 Pandemic.

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