Purpose
In this activity, students will provide energy to an electric circuit using their own muscle power.

Discussion
Batteries last longer in some circuits than they do in others. They last longer when they don't have to "work" so hard. In this activity, you will do the work of the battery. That is, you will power a circuit using the hand-held generator. You will learn which circuits are easier to power and which circuits are harder to power. And you'll gain a better appreciation for what batteries and the local power utility do for you all the time!