Electrical current can be produced by two dissimilar metals

Alessandro Volta pioneered the first battery

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  Voltaic Pile

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  Stack of zinc and silver disks separated by cloth soaked in weak acid or salt

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  Gave a steady flow of electric current

John Daniell invented the first storage cell

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  Copper and zinc electrode in a jar, filled with copper sulfate solution and conc. sulfuric

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  Sulfuric remained on top due to lower density

Dental Amalham is used to fill cavities

Mixture of metals, but mainly mercury

Strong and long lasting

Gold and palladium alloys are also used

Dissimilar metals in your mouth can cause a shock

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  Galvanic event

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  Dissimilar fillings can form an electric cell

Modern cells have an anode and cathode separated by an electrolyte to allows the movement of ions