What you may already know: z The Sun lights and heats our planet.
z
We need energy to do things, for machines to move and for lights to turn on.
z There are costs for heating a home and running a car. z
What you will learn in this chapter:
z What energy is and where energy comes from. z Different forms of energy. z The law of conservation of energy. z How certain objects and devices can store and transfer energy. z Energy conversions that can be seen in nature, in industry, in the home and in the science laboratory.
z What efficiency means in energy conversion devices. z How to design, build and test a device that transforms energy from one form to another.
z
Sources of energy include fossil fuels, wind power and solar energy.
Why does Earth need a sun?
z Why do we insulate houses?
Can you crack this code? The first letter of each of these images spells out a key word that you will come across in this chapter. Use the hints provided if you need to, or revisit the Puzzler after you finish this chapter. 1.
