Why Use a Triode?

Triode, electron tube consisting of three electrodes—cathode filament, anode plate, and control grid—mounted in an evacuated metal or glass container. It has been used as an amplifier for both audio and radio signals, as an oscillator, and in electronic circuits.

Why triode can be used as amplifier?

The AC voltage and current magnitudes on the tube's grid are generally quite small compared to the variation of voltage and current in the plate circuit. Thus, the triode functions as an amplifier.

What is the primary difference between a diode and a triode?

The main difference between Diode and Triode is that the diode is an electronic component with two terminals that allows current to flow in one direction and Triode is a single grid amplifying vacuum tube having three active electrodes.