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Thermionic emission

Q: The principle of heating a filament to obtain a movement of electrons is called?

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Thermionic emission

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To provide sufficient resistance to electrons so that heat produced will cause thermionic emission.

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There are three electrodes: cathode (filament) grid and anode.

The "third" will be the one you do not already know the name of.

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A filament is needed in a Cathode Ray Oscilloscope (CRO) to emit electrons in the cathode-ray tube. The electrons are accelerated towards the screen to create the electron beam, which is then deflected to produce the display. The filament heats up and emits electrons through thermionic emission, contributing to the functioning of the CRO.

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