Action of the simple cell

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Action of the simple cell Although Volta found that various metals and salt or acid solutions could be used to make a simple cell. it is customary today to regard a simple cell as being composed of a plate of copper and a plate of zinc dipping into dilute sulphuric acid (Fig. 34.4). When the copper and zinc […]

The condensing electroscope

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The condensing electroscope Volta was able to show that the copper plate of a simple cell was charged positively and the zinc plate negatively by means of the condensing electroscope. This was an instrument which he had designed for the purpose of detecting very small potential differences. It comprises a gold-leaf electroscope, the cap of which is […]

The voltaic pile

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The voltaic pile To support his views Volta constructed a pile of pairs of silver and zinc discs separated by discs of cardboard soaked in brine (Fig. 34.2 ({I)). On touching the top and bottom discs simultaneously he received an electric shock. Further experiments showed that similar results could be obtained with other metals in conjunction with solutions […]

Electric cells

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Electric cells Towards the end of the eighteenth century, Luigi Galvani, Professor of Anatomy at Bologna University in Italy, published a book describing a series of investigations he had made on the subject of “animal electricity”. In this book he described how a freshly dissected frog’s leg could be thrown into muscular convulsions, simply by connecting the foot and […]