Ais an electronic device that can hold an electrical charge for a period of time and can smooth the uneven flow of electricity through a circuit.

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The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips.