I use two batteries and a galvanometer to observe the "appearance" of electrical energy. I then repeat the process with a moving magnet/coil to understand their role in generating electricity.
I use a marble that falls from a height, move the magnet, and discuss the energy conversions involved.
Instead of using a marble and simple magnet movement, I use water and continuous rotation of the magnet in front of the coil—demonstrating a model based on the operating principle of a hydroelectric power plant.
I summarize the previous steps through an interactive video simulating the operation of a hydroelectric power plant.