Energy is the ability to do work. Energy can't be either created or destroyed, it just change from one form into another form. This change is called Energy Transformation.
Three short demonstrations that expand your understanding of energy. First, using peanuts and heat, you can see how the human body uses food to make energy. Then, you can create paper snake mobiles to explore how heat energy can cause motion. Finally, you can determine the effect that heat energy from the sun (or a lamp) has on temperature by placing pans of water in different locations.