This was a project to help kids learn about hydroelectricity. The bottle contained water that kids would squeeze to make the wheel turn. Depending on the pressure and the amount of water used the wheel would turn and light up appliances on the image beside the container.

This design was created in order to place the LED on it so that it could be compared to the LED's. If the water wheel was spinning really fast then it would reach all the appliances.

This is at a school in Norway where kids are learning about Hydroelectricity. The kids were able to squeeze water onto the wheel to make it turn to the appliance they wanted.