There are a number of open source resources available for labs and simulations. Below are few of the links that can be used to locate images, streaming videos for your courses.
This website contains a number of STEM related videos which can be beneficial for students.
A free interactive circuit simulator.
Use the filter Sort Courses by, Filter by Feature, Filter by level to find appropriate resources for your course. Search with key word lab along with your subject of interest. Navigate to any suitable search result. Click on the tool/ labs option in the landing page. Videos of the lab or the lab equipment images are also available to help the student understand the procedure better.