Electrochemical Cell

An electrochemical cell is a device capable of either deriving electrical energy from chemical reactions, or facilitating chemical reactions through the introduction of electrical energy. A common example of an electrochemical cell is a standard 1.5-volt "battery". (Actually a single "Galvanic cell"; a battery properly consists of multiple cells, connected in either parallel or series pattern.)

Read more about Electrochemical Cell:  Half-cells

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    each in the cell of himself is almost convinced of his freedom,
    —W.H. (Wystan Hugh)