TOPIC 1. What Is Energy ?

Energy causes things to happen around us. Look out the window. During the day, the sun gives out light and heat energy. At night, street lamps use electrical energy to light our way. When a car drives by, it is being powered by gasoline, a type of stored energy. The food we eat contains energy. We use that energy to work and play.


What Is Energy ?
Energy Basics
Changing Energy
Energy Conversion Efficiency



Go to Topic 2. Power Sources for the Safety Light System