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How did the cathode ray tube work?

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In a TV's cathode ray tube, the stream of electrons is focused by a focusing anode into a tight beam and then accelerated by an accelerating anode. This tight, high-speed beam of electrons flies through the vacuum in the tube and hits the flat screen at the other end of the tube. read more

A cathode ray tube works by sending electrons from the negatively charged cathode to the positively charge anode, which has a small tube to allow electrons to exit out in a focused line onto a screen. read more

It was cathode ray tubes that allowed the English physicist J.J. Thomson to discover the existence of electrons in 1897. How Cathode Ray Tubes Work Before we see how J.J. Thomson used the cathode ray tube to discover the electron, we need to know how a cathode ray tube works. read more

In a cathode ray tube, the "cathode" is a heated filament (not unlike the filament in a normal light bulb). The heated filament is in a vacuum created inside a glass "tube." The "ray" is a stream of electrons that naturally pour off a heated cathode into the vacuum. read more

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