Experiments and inquiry-based learning in online in-service physics teacher training

Experiments and active and inquiry-based learning are important features of both formal and informal in-service physics teacher training in the Heureka and Elixir to Schools projects in the Czech Republic. Traditionally, the activities of these projects relied heavily on personal contacts and direct interaction with teachers who actively performed experiments, constructed simple tools, and learned using an inquiry-based approach at the seminars. However, restrictions due to the Covid pandemic prevented direct contact with teachers since spring 2020. Nevertheless, it appears that real experiments done by participants, inquiry and active work can be maintained even in the restricted format of online seminars. The aim of this paper is to describe and summarize positive experience gained from various types of such seminars.