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by

## jorge rivera

on 4 January 2013

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Homemade Battery Testable Question How many coins in a pile will the make the most electricity? Hypothesis I predict that if more coins are added then the voltage is going to go up. Materials Pennies
Nickels
Mild dish soap
Vinegar
Salt
Small bowl
Small plate
Digital multimeter
Paper towels
Scissors Procedures 1. In a small bowl mix together 1/4 cup of vinegar and 1tsp of salt
2. Using the scissors cut up the paper towel into small squares
3. Place the small square to soak in the bowl of the salt-vinegar solution set them aside
4. Gather some pennies and nickels wash them with the soap and dry (just to remove the dirt)
5. Start building the stack on a dry paper towel on the plate. Put down the penny first then the vinegar-soaked towel on top then the nickel. keep repeating until you have of 4 coins (make sure the nickel ends up on top)
6. Attach the leads of the multimeter to the ends of the battery by touching 1 lead to the penny on the bottom and the other to the nickel on top
7. Measure the voltage produced by the battery (in milivolts)
8. Repeat the experiment each time building a battery with a different number of coins (always put the penny on the top) Conclusion The more cells (nickel and penny)added the higher the voltage went.Some possible errors can be that the voltmeter could have been off by the way it read the volts.The investigation can be furthered by using different materials like using lemon juice instead of vinegar or different coins instead of pennies and nickels
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