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A Battery That Makes "Cents"

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Melissa Velasco Price

on 9 January 2015

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Transcript of A Battery That Makes "Cents"

Joseph Price
A Battery That Makes

Question Hypothesis
How will a different number of coins (pennies & nickels) affect the amount of electricity produced? Since each coin is made up of a different metal, one metal reacts different than the other either stronger or weaker.

I believe that more layers of coins will make a more powerful homemade battery. Since there will be more metal, more electricity can be created.
Materials & Equipment
Pennies (6)
Nickels (6)
Mild dish soap
Vinegar (any kind, 1/4 C.)
Salt (1 Tbsp.)
Small bowl
Small plate ( StyrofoamTM)
Digital multimeter (any kind that reads mA and mV)
Paper towels
In a small bowl, mix together 1/4 C. of vinegar (electrolyte) and 1 Tbsp. of salt (ions).
Using scissors, cut up a paper towel into small squares, each approximately 1 cm x 1 cm.
Place the small squares to soak in the bowl of salt-vinegar solution, and set them aside.
Gather some pennies and nickels, wash with a mild detergent to remove dirt and dry,
Begin 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.
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).
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.
This experiment proves that you can create battery voltage using pennies and nickels. My hypothesis was correct in that the more coins added created more electricity. When we went from 6 to 8 coins the voltage decreased, but this was not sustained when we increased to 10 and 12 coins.

I learned you can make enough voltage to create your own homemade batteries.
This experiment will make a battery out of pennies and nickles and 1x1 cm paper towel soaked in vinegar and salt.
Full transcript