Items related to Notes on physics
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ... flow from the copper through the wire to the zinc. As has been pointed out in a previous chapter (p. 315), this is a legacy that has come down to us from the time when it was thought that the positive charge moved, or flowed; and although we now know that it is the negatively charged electrons that flow through the wire from the zine to the copper, we are still, and probably always shall be, constrained to speak of the current as flowing from the high potential copper to the low potential zinc. It has likewise been pointed out that the exterior effect of a negative charge moving in the negative direction is the same as that of a positive charge moving in the positive direction. We may therefore avoid all ambiguity and all confusion by discriminating carefully between the direction of flow of the electrons, and the direction of flow of the current; and when the current is mentioned as flowing in a particular direction, we may always understand that what is actually taking place is that the electron are flowing in the opposite direction. 434. The Explanation of Local Action. We are now in a position to understand the true nature of local action (p. 407). and to explain the rapid evolution of hydrogen gas when ordinary zinc is treated with dilute sulphuric acid. The solution tension of the particles of the carbon, which forms the chief impurity in commercial zinc, is even less than that of copper, and at the same time carbon is an excellent conductor of electricity. When, therefore, the impure zinc, with its particles of carbon adhering to it, is placed in an electrolyte, the zinc tends to dissolve just as if it were chemically pure, and the Zn ions which thus go into solution, tend to repel H ions and force them out of the solution. By touching...
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- PublisherRareBooksClub.com
- Publication date2012
- ISBN 10 1153400626
- ISBN 13 9781153400626
- BindingPaperback
- Number of pages254
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