This thesis we present an example of a research-based online lesson for second grade high school students on the topic of Work and Power of Electric Current. The lesson was prepared with the help of virtual laboratories on the Go-Lab portal and the Google form which, in addition to providing content, also provided insights into the statistics of the success of the lesson. Related web content was also created, including a pre-quiz for the subject repetition and the text of the theoretical explanation of the lesson. The research approach was implemented using a virtual laboratory in which the power of the heater was determined by measuring the rate of change of water temperature in the calorimeter. Another virtual lab was used to measure the dependence of the lamp's output on its resistance at constant voltage and on the voltage at constant resistance. By analysing and interpretating the results of their own measurements, the students were able to formulate a mathematical expression for the power of electric current. Finally, they completed a questionnaire with conceptual questions and tasks related to everyday life, that tested their ability to apply the knowledge they had acquired. The results of the investigation indicate student difficulties, most often in drawing and interpreting graphs. We adapted the lesson content to the Go-Lab platform by creating our own ILS. We have also designed a suitable guide for developing ILS to introduce other teachers to this method.