Why are vacuum tubes also called valves?

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Why are vacuum tubes also called valves?

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1) The storage subsystem in a microcomputer consists mainly of __ or __ media with varying capacities

2) Find out who is not the inventor of transistors among following names

3) Which unit converts computer data into human readable form?

4) The programs which are as permanent as hardware and stored in ROM is known as

5) Which generation of computer is still under development

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