|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
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coulomb cou·lomb (k&oomacr;'lŏm', -lōm')
The unit of electrical charge in the meter-kilogram-second system equal to the quantity of charge transferred in one second by a steady current of one ampere.
|coulomb (k'lŏm', k'lōm') Pronunciation Key
The SI derived unit used to measure electric charge. One coulomb is equal to the quantity of charge that passes through a cross-section of a conductor in one second, given a current of one ampere.
|Coulomb, Charles Augustin de 1736-1806.
French physicist who was a pioneer in the study of magnetism and electricity. He is best known for the formulation of Coulomb's law, which he developed as a result of his investigations of Joseph Priestley's work on electrical repulsion. Coulomb also established a law governing the attraction and repulsion of magnetic poles. The coulomb unit of electric charge is named for him.