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Early Invention
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21. The Battery
A battery is a device that converts chemical energy into electrical energy. Each battery has two electrodes, an anode (the positive end) and a cathode (the negative end). An electrical pathway runs between these two electrodes (since there is a voltage/potential difference between them), going through a chemical called an electrolyte (which can be either liquid or solid). This unit consisting of two electrodes is called a cell (often called a voltaic cell). Batteries are used to power many devices and are also used make the spark that starts a gasoline engine.

The first battery-like discovery occurred in 1786, when Count Luigi Galvani (an Italian anatomist, 1737-1798) found that when the muscles of a dead frog were touched by two pieces of different metals, the muscle tissue twitched.

Count Alessandro Giuseppe Antonio Anastasio Volta (Feb. 18, 1745- March 5, 1827) was an Italian physicist who realized that the twitching was caused by an electrical current that was created by chemicals. Volta invented the chemical battery (also called the voltaic pile) in 1800. His first voltaic piles were made from zinc and silver plates (separated by a cloth) put in a salt water bath. (This is similar to the unpleasant phenomenon that happens when people with metal tooth fillings bite into aluminum foil -- a small electrical current flows from one metal to the other metal, flowing through the acidic saliva and giving the biter an unpleasant sensation.) Volta soon improved the pile, using zinc and copper in a weak sulfuric acid bath. Volta's invention provided the first generator of continuous electrical current.
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