·    A TV is made out of a vacuum tube with heated filament cathode.

And coated with Phospor.

·     The majority of televisions today are powered by a Cathode Ray Tube (CRT).

·     The cathode ray tube is polar.

·     The positive end is called the "anode" and the negative end is the "cathode".

·     The cathode is a heated filament similar to a light bulb and the ray a stream of electrons that naturally pour off a heated cathode into the vacuum.

·     The anode then attracts the electrons pouring off the cathode through a tight, high-speed beam.

·     This beam then hits the screen which is coated with phosphors that glow when struck by the beam.

·     The beam is controlled by steering coils using different voltages, thus allowing the beam to hit any point on the screen. 

·    In color TV's, there are 3 beams in red, green, and blue which when mixed, can create 256-color images.

·    White color is produced by mixing all the 3 beams in perfect proportion.

·    Black is produce simply by turning off all the beam at the particular point or spot.

·    Sounds complicated? Not quite. It's simple, yet entertaining science.

 

 
 

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