How to make electricity with lemon
The lemon contain citric acid, which will Cause the some reaction as other weak acids. Tomatoes and citrus fruits usually contain enough acid to affect the galvanometer.
Note:Adult supervision is required
- Large, fresh lemon
- Zinc and copper strip
- Just for fun, let’s try to make a battery from a lemon.
- Make two small slits in the lemon, close together, with the knife.
- Attach the copper strip to one wire of the galvanometer and insert it into of the slits in the lemon.
- Push the zinc strip into the other slit. The zinc strip must not touch the copper strip.
- Wait a few seconds, then observe the needle on the galvanometer as you firmly touch the wire to the zinc strip. What happened? Wait a few seconds more and try again.
- Using information you learned in activities 8.17 and 8.18, explain what is happening.
- Could you use another fruit such as a grapefruit or a tomato? Try it.
For critical thinker: There are many chemicals that can be used to create a flow of electrons. Try this activity with other citrus fruits. Try it with the juice in a cup instead of using the fruit itself. Try a penny in the place of the copper strip, and a silver dime (you’ll have to find one that’s several year old to get silver) instead of the zinc. Take it from there and continue your exploration. Be sure to write everything you use and what happened, so you will remember and be able to share your information.
SKILLS: Observing, inferring, communicating, comparing and contrasting, formulating hypotheses, identifying and controlling variables, experiment.