With the counter assembly removed, the aluminum wheel is exposed. This is where the action happens; the wheel is driven at a speed that reflects the amount of Power currently being used. The gold colored shaft in the center of the wheel is how the revolutions are transmitted to the counter and accumulated.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.