Learn the basics of what energy is, how it is converted into other forms, and why some sources of energy are more useful and efficient than others.

Play the Energy Lab: http://www.pbs.org/wgbh/nova/labs/lab/energy/

Find discussion questions for this video and other resources in the Energy Lab collection on PBS LearningMedia: http://www.pbslearningmedia.org/resource/nvel.sci.phy.defined/energy-defined/