Students watch the teacher demonstrate the OJ powered clock. The teacher guides students to wonder what they could change to make the clock work. They do some brainstorming and then the next period, they try it out themselves. There are some optional pre-lab activities that the students could do to explore how to change variables and teachers may want to incorporate post-laboratory literacy activities about alternative sources of energy (optional).
Other Resources:
https://www.flinnsci.com/citrus-battery-contest/dc10830/
https://www.scientificamerican.com/article/generate-electricity-with-a-lemon-battery/
https://spark.adobe.com/video/cA5w8RIl1MJ2k