Question
Which element of a vacuum tube regulates the flow of electrons between cathode and plate?
Answer Options
- A) Control grid
- B) Suppressor grid
- C) Screen grid
- D) Trigger electrode
Correct Answer: A
Explanation
A vacuum tube (or valve) works by controlling the flow of electrons emitted from a heated cathode (negative terminal) toward a positively charged plate (anode). The element responsible for controlling this flow is the control grid.
The control grid is a fine mesh placed close to the cathode. By varying the negative voltage applied to the control grid, the operator can increase or decrease the electric field, which, in turn, regulates the number of electrons reaching the plate. This makes the control grid the primary input for amplifying or modulating the signal in a vacuum tube amplifier.
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