Johan Carlsson
PennySanding.jpgThree post-1982 pennies, sandpaper, and lots of elbow grease!JPEG Image - 69.50 kB - 06/09/2020 at 00:20 |
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PennyZincCore1.jpgThe zinc core is peeping throughJPEG Image - 74.72 kB - 06/09/2020 at 00:20 |
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PennyZincCore2.jpgSeven minutes later, the copper coating is almost goneJPEG Image - 82.70 kB - 06/09/2020 at 00:20 |
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HydrogenReduction.jpgDropping a penny with exposed zinc core into household vinegar to estimate self-discharge rate for a Volta pile with that electrolyte (found to be weeks)JPEG Image - 28.54 kB - 06/09/2020 at 00:20 |
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SandPaper.jpgDifferent sandpaper grit. There was no obvious winner.JPEG Image - 22.41 kB - 06/09/2020 at 00:20 |
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CoffeeFilterSeparator.jpgHandy separator material for the Galvanic cellsJPEG Image - 11.54 kB - 06/09/2020 at 00:20 |
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VoltaPileVoltage.jpgAlmost 1.7 V open-circuit voltage, or 0.55 V per cell.JPEG Image - 62.89 kB - 06/09/2020 at 00:12 |
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LitLED.jpgThe penny Volta pile lights a red LED!JPEG Image - 31.19 kB - 06/09/2020 at 00:12 |
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FinishedVoltaPile.jpgThe sandwiched pennies and separators make a Volta pile!JPEG Image - 27.85 kB - 06/09/2020 at 00:12 |
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SeparatorSoaking.jpgSoak the separator in household vinegarJPEG Image - 46.83 kB - 06/09/2020 at 00:12 |
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PileEndsWithLeadsInside.jpgInside of Volta-pile ends. One is copper (positive end of battery), the other is zinc (negative end of battery).JPEG Image - 69.12 kB - 06/09/2020 at 00:11 |
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PileEndsWithLeadsOutside.jpgLeads soldered to outside of the Volta-pile endsJPEG Image - 86.56 kB - 06/09/2020 at 00:11 |
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PenniesExposedZinc.jpgThree pennies with the zinc core exposed on one sideJPEG Image - 80.65 kB - 06/09/2020 at 00:11 |
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SeparatorTrimming2.jpgMore separator trimmingJPEG Image - 36.11 kB - 06/09/2020 at 00:11 |
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SeparatorTrimming1.jpgCut the separator down to the diameter of a pennyJPEG Image - 27.66 kB - 06/09/2020 at 00:11 |
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SeparatorPizzaSlice.jpgFolded coffee filter used as Galvanic-cell separatorJPEG Image - 20.82 kB - 06/09/2020 at 00:08 |
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Science-Fair Penny Volta Pile
My son and I did this 3-cell, 4-penny Volta pile for his 3rd grade Science Fair. His school is closed, so we're putting the project online.