domestic electric supply

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caramba22242 | 14:19 Mon 06th Jun 2005 | Science
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what hertz is domestic electricity. I bought a TV that should have a refresh rate of 100 hertz but on the back of it it says only use 50hz. Before I go shouting my mouth off at the company I thought I better check out domestic electricity supply first. 


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on your tv, refresh rate is not the same as electric supply frequency. Just plug it in.

Good grief. What clock s[eed speed does your computer run at? At a rough guess it's several hundred thousand times faster than 50Hz.

When connected to a UK TV signal, you are not going to get a refresh rate of more than 50Hz, as that's what it's broadcast at. You may get a slightly sharper picture due to the improved electronics, but the real reason for 100Hz TVs is future-proofing. Whenever High Definition TV arrives in the UK (3 or 4 years?), it is supposed to be broadcast at 100Hz. However, by that time the specs might have all changed again!

Further to finex's explanation, the 100Hz refresh rate was developed in the 80's and uses a digital process to remove picture flicker from analogue broadcasts. As such it is not directly linked to HDTV which is actually an increase of the scan lines used from 625 (for PAL) to 1080 but, of course, a digital signal could utilise this increased update frequency.

I would have replied quicker but my PC only operates at 50Hz.

Heh, nice :-)

Whilst I was aware of the increased resolution, I also understood that the 100Hz refresh rate would be used. Is it still going to be PAL but at 100Hz, so we get alternate lines refreshing, or is that going too?  

finex seems to confusing the refresh rate with the fram rate: "When connected to a UK TV signal, you are not going to get a refresh rate of more than 50Hz,". The UK PAL signal uses an interlaced rate of 25 FPS, thus 50 Hz. But if you store the signal, you can then rescan the screen a scond time with the same signal. Why is this better? As soon as the dots have been illuminated by the electron beam, they start to fade, so the more often you scan them, the brighter and more flicker-free the picture.
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hey you guys.I'm more confused than ever.Are you saying that my 100hz TV can at this moment in time only refresh at 50hz. ??? 
50 Hz is the frequency of the electricity mains supply to the TV (and everything else in your house). The 100 Hz refers to the way that the picture is produced on the screen and has a less noticable flicker than standard TVs. It has nothing to do with the 50Hz quoted on the label at the back.

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