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Old 07-05-2006, 07:15 AM   #1 (permalink)
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Default why crt's so high voltage

the cathode tube they hold up to 20,000 volts dont they is that for any crt no matter what size it is, why do they hold that much

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Old 07-05-2006, 07:22 AM   #2 (permalink)
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This should help you out


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Old 07-05-2006, 08:47 AM   #3 (permalink)
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Electrons are negative. The anode is positive, so it attracts the electrons pouring off the cathode. 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. This screen is coated with phosphor, which glows when struck by the beam.
voltage is basically the difference in the amount of electrons between two ummm... things, they could be anything really (unless they don't allow much flow of electrons if any, like rubber). but for electricity to move, the electrons must be attracted to something. in a thing with not many electrons, electrons in abundance from another thing will flow more readily towards it.

anyway, this is a pretty poor explanation, but what I'm basically saying is that, the more voltage, the more electrons are attracted to the screen. and that's how the monitor can be quite bright.

did you know static electricity can be thousands of volts?
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Old 07-05-2006, 09:43 AM   #4 (permalink)
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expanding on what apok just said, when you get a static shock and a spark jumps from your body to the object that is said to be 30,000+v!!!!!

voltage is not necessarily harmful, current is more damaging.
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Old 07-05-2006, 11:21 AM   #5 (permalink)
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Look at voltage vs amperage.
Thats should solve all of your questions.

Anyways, a crt is basically xray tube.
And if you have an old or cheap monitor/tv, you could be xraying your head, body....and of course....genitals....

There is also a link between such leaking radiation with kids with birth defects and kids getting crooked teeth.
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Old 07-05-2006, 12:07 PM   #6 (permalink)
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Have you ever been zapped by a sparkplug, from a car or a dirtbike/ATV or whatever? I have (hurts too). They have around 70,000 volts...but no amps, so they don't hurt you (well it's painful, but they do no damage).

But that's not to say that being electricuted by your TV is a good thing, because that 30,000v's is backed up by 25 - 30amps, so you'll most likely die.


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