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electron gun 
Device that emits electron beams toward the screen; there are beams for each of the primary colors, red, green and blue.
red beam
Electron beam hitting the sensitive parts of the screen that are designed to emit red light.
green beam
Electron beam hitting the sensitive parts of the screen that are designed to emit green light.
blue beam
Electron beam hitting the sensitive parts of the screen that are designed to emit blue light.
grid
Electrode with openings, which allow electrons to pass through; it helps regulate the intensity of the beams directed toward the screen.
magnetic field
Zone exhibiting the properties of a magnet; it controls the direction of the electron beams so that the entire screen is covered.
