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what is lechlenche and daniell. what is means black in Com. and red in + in multimeter and why we used article an before LED e.g. an LED
Leclanche cell: carbon anode, surrounded by crushed carbon and manganese dioxide in a porous container, immersed in an electrolyte of aqueous ammonium chloride into which the zinc cathode dips. The common dry battery is a form of Leclanché cell
Daniell cell: The Daniell cell (var. sp. Daniel cell) was invented in 1836 by John Frederic Daniell, a British chemist and meteorologist, and consisted of a copper pot filled with a copper sulfate solution, in which was immersed an unglazed earthenware container filled with sulfuric acid and a zinc electrode. He was searching for a way to eliminate the hydrogen bubble problem found in the Voltaic pile, and his solution was to use a second electrolyte to consume the hydrogen produced by the first. Zinc sulfate may be substituted for the sulfuric acid. The Daniell cell was a great improvement over the existing technology used in the early days of battery development. A later variant of the Daniell cell called the gravity cell or crowfoot cell was invented in the 1860s by a Frenchman named Callaud and became a popular choice for electrical telegraphy.
The black test lead always plugs into the black socket on the multimeter: the one marked "COM" for "common." The red test lead plugs into either the red socket marked for voltage and resistance, or the red socket marked for current, depending on which quantity you intend to measure with the multimeter.
we use the article "an" before LED because we pronounce LED as "el e d"!! so when we say "el", it is a vowel appearing at the beginning and hence we you the article "an"!
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