Why are vacuum tubes also called valves?
A.Because they can amplify the weak signals and make them strong
B.Because they can stop or allow the flow of current
C.Both of above
D.None of above
Answer:B
Why are vacuum tubes also called valves?
A.Because they can amplify the weak signals and make them strong B.Because they can stop or allow the flow of current C.Both of above D.None of above