|Mark Rand||23/04/2018 20:49:10|
|333 forum posts|
Just a couple of points:-
Supply voltage across the rest of the EU is 230V, not 220V
Power is I^2.R, not I^2/R
Resistive power loss in distribution is proportional to the square of the current, so 19%, not 9%.
The US 220V supply is single phase centre tapped, not two phase (two phase has been used in both the US and UK, but it needs the same number of cables for less power so it isn't used anymore except for a very small number of locations)
OK, four points
Edited By Mark Rand on 23/04/2018 20:59:10
|Mike Poole||23/04/2018 21:11:20|
1261 forum posts
Like us the rest of the EU is 230V in reality they are 220V and we are 240V the fudge is that we say we are 230V when nobody actually is.
|25 forum posts|
I've just replaced a few very old fluorescents in my garage/workshop with LED strip lighting. I went for a fairly bright (12W/metre, I think) LED strip, daylight colour, and I now have 6 2m lengths. I bought the aluminium channel made for the purpose which takes a diffuser strip - added quite a bit to the cost but gives decent heat-sinking and the diffuser seems to do its job. I'm very pleased with the result although I can't comment on LED life as it's only been up for a couple of weeks. I went for a more expensive LED strip from a UK supplier rather than a cheap Chinese version but I'm using a cheap Chinese power supply. These are pretty cheap and experience with others is that they seem to be pretty reliable. They also maintain a well-regulated output voltage over a fairly wide input range, so I don't care about mains voltage fluctuations.
I'll be back in a couple of years to tell you if they are all still working! I agree with an earlier post that LED bulbs used around the house vary a lot in reliability - more expensive branded versions have worked well but life of the cheap ones is less than the tungsten bulbs they replaced.
|Wout Moerman||24/04/2018 22:50:37|
|35 forum posts|
I'm in the Netherlands and we actually have 230 volts AC. Plus or minus 2 volts. 220 V is long ago, but I often still call it 220 and so do many others. So that might lead to the conclusion that we still have 220 volts.
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