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# a battery that makes cents

tyler holland
by

## tyler holland

on 6 November 2013

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#### Transcript of a battery that makes cents

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Materials
Conclusion
Question: How does the amount of pennies and nickels added to a pile affect the amount of electricity in a current?

Hypothesis: I think every time that I add 2 pennies, 2 nickels, and a paper towel, the voltage and the current will get stronger.
A Battery That Makes

"Cents"

By:
Tyler Holland
Experiment
Materials and Equipment

•Pennies (10)
•Nickels (10)
•Mild dish soap
•Vinegar (any kind, 1/4 C.)
•Salt (1 Tbsp.)
•Small bowl
•Small plate (ceramic, plastic, or StyrofoamTM; not paper or metal)
•Digital multimeter (any kind that reads mA and mV), available at Amazon.com
•Paper towels (2)
•Scissors
Question And Hypothesis
How Batteries Work
Procedure
1. In a small bowl, mix together 1/4 C. of vinegar (electrolyte) and 1 Tbsp. of salt (ions).
2. Using scissors, cut up a paper towel into small squares, each approximately 1 cm x 1 cm.
3. Place the small squares to soak in the bowl of salt-vinegar solution, and set them aside.
4. Gather some pennies and nickels, wash with a mild detergent (like dish soap), and dry. This is just a preliminary step to remove dirt and grime.
5. Start building your stack on a dry paper towel on your plate. Put down a penny first, then place a square of vinegar-soaked paper towel on top, and then add a nickel. Keep repeating the layers until you have a stack of four coins (alternating pennies, wet paper towel pieces, and nickels), making sure you end with a nickel on top.
6.Attach the leads of the multimeter to the two ends of the battery by touching one lead to the penny on the bottom and the other to the nickel on the top. Measure the voltage produced by your battery (in millivolts, mV). You can also measure the current produced (in milliamps, mA).
7.Repeat the experiment, each time building a battery with a different number of coins. One important rule is to always start with a penny and end in a nickel, so the number of layers of pennies and nickels will always match. Why do you think this is necessary?
For this experiment we are going to make a battery out of nickels, pennies, and 1 by 1 centimeter paper towel squares soaked in a solution that is made of vinegar and salt.
In this experiment i collected 10 pennies, 10 nickels and 10 pieces of paper towel which i dipped in a substance. My hypothesis was wrong i thought it would go up 100 each time but there was not a steady rate of increase.
Bibliography
http://www.sciencebuddies.org/science-fair-projects/project_ideas/Energy_p015.shtml#procedure

Independent and dependent variable
independent: 2 pennies and 2 nickels
dependent:the strength of the current
Results
Full transcript