How does a television work?

Jeeves

It receives electomagnetic signals from a remote transmitter and converts them into visible and audible signals that soften the brains of the people sat in front of the television. Those with a strong will resist the temptation to watch and answer questions on the internet. Feb 10 02, 4:57 PM

Gnomon

The screen is covered in phosphorescent coating on the inside. An electron gun shoots electrons at the screen. Where the electrons hit the screen, it glows. Magnetic and electric fields are used to steer the beam of electrons so that they scan the screen in a series of lines (625 in the PAL system). Radio signals received from the aerial contain information which tell the electron beam how strong it should be at any instant and therefore how bright. Feb 11 02, 2:51 AM

_princess_007

First, a video camera is used to record the image and a sound recording system, which may be built into the camera, records the sound. The light in the setting bounces off the actor or object being recorded and into the video camera. The image goes through the lens and onto a wire-meshed target plate where an electron gun scans the image in lines. In color cameras, the scanned image then hits color-filtering mirrors of the three primaries. Next, the scanned image in all three colors is transmitted to an encoder, which may be separate from the camera. The encoder combines the three primary color information into one signal, which is then transferred to a transmitter, joining this signal with that of the recorded sound, which has been amplified. The signal then is broadcast from an antenna. Although satellites may be used to transfer it, the combined color and sound signal will eventually reach the receiving antenna on your home. From here, the signal goes down into your living room and goes through a tuner. The tuner splits the sound and color signals apart. The sound, or audio signal is then amplified and comes out your speaker. Simultaneously, the color signals are fed into a decoder and then into the tube of your television set. Here, electron guns of the three primaries fire electron beams through a shadow mask onto a phosphorous-coated screen. The shadow mask is what makes the television image appear to be made of spots when closely examined. The electron guns rapidly change the position and color of the dots, creating the illusion of a moving picture. http://share4.esd105.wednet.edu/wachtelg/journey.htm Nov 21 06, 4:22 PM

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