Why are vacuum tubes also called valves?

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Why are vacuum tubes also called valves?



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1) What is the name of the new color laptop computer which is powered by a 386 processor at 33 MHz and is built by Epson?

2) Which computer was considered the first electronic computer until 1973 when court invalidated the patent?

3) Who invented vacuum tubes?

4) What are the three decisions making operations performed by the ALU of a computer?

5) A Compiler is _____________________.

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