hat goes on under the CopperTop
From the outside it seems simple enough, if even rather elegant. You turn on a device, your Duracell® alkaline battery powers it. On the inside, however, things aren't that simple. Batteries are highly engineered electrochemical cells. They convert chemical energy to electrical energy using three major materials: the anode, the cathode, and the electrolyte. How these materials get picked for the job depends on how well they give up or attract electrons, something that must happen for an electric current to be generated. The anode is often a metal, the cathode a metallic oxide, the electrolyte an electricity conductor.
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