We use many devices that transform energy from one form to another. Sometimes a whole chain of transformations takes place. They often do it so smoothly that we don't even realize what's happening. Each step usually involves some loss of useful energy. An automobile engine, for instance, is only 30 per cent efficient. That is, only 30 percent of the available energy in gasoline is available to move the car.

Think of an example where energy is transformed several times before it is used. List each of the forms of energy in the chain. What do you think the efficiency is for each step? Where do you think the wasted energy goes?