Q.
Answers (6)
1.
First invented by a British scientist named John A. Fleming, although Edison had made some dsicoveries while working on the lightbulb. The vacuum tube was improved by Lee DeForest.
Answered by LIPSIKA, 28 Jan 01:10 pm
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2.
Although the discovery was made of the principles for the vacuum tube around 1873 it was not put into practice until the early 1900's.
Answered by Ataur Rahman, 28 Jan 11:37 am
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3.
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4.
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5.
In 1907 American inventor Lee De Forest invented it. triodes, diodes, pentodes are some of the examples. later on they were replaced by n-p-n technology based transistors and now by integrated circuits and SMD'S.
Answered by Manoj Joshi, 28 Jan 11:54 am
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6.
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