Is there anyone you know who doesn’t understand how a water faucet works? Probably not. Your students are surely confident they know all there is to know about faucets: they deliver hot and cold water at various rates, depending on how you set the taps. What else is there to it, right? This is an important starting point for introducing the PowerWheel. It’s a chance to prove that—along with providing water—a common household faucet can also deliver a considerable amount of usable power.