Energy comes in many forms - electrical, mechanical, chemical, light, nuclear - and it can be stored in many ways - batteries, springs, water towers, gasoline, radioactive materials. To make use of energy, we often want to change it from one form to another, then store it, then transform it again and use it later on.

Think of two kinds of energy that you make use of in and around your house. Where does each kind come from? How is it stored before you use it? What do you do with the energy? Answer these questions in Notes on your handheld computer.