Alessandro Volta: The Voltaic Pile Experiment - The Invention of the Battery

Alessandro Volta 1745-1827
There is evidence that primitive batteries were used in Iraq and Egypt as early as 200 B.C. for electroplating and precious metal gilding. In 1748, Benjamin Franklin coined the term battery to describe an array of charged glass plates.

Around the 1790s, through numerous observations and experiments, Luigi Galvani, an Italian professor of anatomy, caused muscular contraction in a frog by touching its nerves with electrostatically charged metal. Later, he was able to cause muscular contraction by touching the nerve with different metals without a source of electrostatic charge. He concluded that animal tissue contained an innate vital force, which he termed "animal electricity."

In fact, it was Volta's famous disagreement with Galvani's theory of animal electricity that led Volta, in 1800, to build the voltaic pile to prove that electricity did not come from the animal tissue but was generated by the contact of different metals in a moist environment.

Most historians attribute the invention of the battery to Alessandro Volta since his voltaic pile was the first battery that produced a reliable, steady current of electricity.

Volta’s invention was to give rise to electrochemistry, electromagnetism and the modern applications of electricity. Also Galvani's idea of animal electricity did not prove useless. Galvani’s research was soon to develop into electrophysiology and modern biology.

After Volta is called the "volt", the unit of electromotive force; after Galvani is called the galvanometer - an instrument for detecting and measuring small electric currents.

The Voltaic Pail Experiment
Alessandro Volta’s Original “Pile”

Credit: Tempio Voltiano Alessandro Volta’s Original “Pile
Basically, Volta’s pile was a messy stack (pile) of discs made of two types of metal - one silver, the other zinc. The discs were separated from each other by a piece of cloth or cardboard that had been soaked in salt water (brine). Volta found that this wet stack of “dissimilar metals” created a small electric current, and this current could be drawn off through wires and used for experiments. However, a pile could generate only a small voltage of 1-2 volts. Several piles - a “battery” of them - could be assembled side by side and connected to each other with metal strips to create a high power energy source.

Volta : Science and Culture in the Age of Enlightenment
Provides fascinating details, many previously unknown, the author depicts Volta as an inventor who used his international network of acquaintances to further his quest to harness the power of electricity.

The Ambiguous Frog: The Galvani-Volta Controversy on Animal Electricity
This lively debate erupted when two scientists, Volta and Galvani, each examining the muscle contractions of a dissected frog in contact with metal, came up with opposing but experimentally valid explanations of the phenomenon.

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