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Another 115v Vs 240v question, - Page 2

post #11 of 15
we have 240, in UK .. but the uk is crap, so could we swap and ull have 240 without rewiring the house?
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post #12 of 15
Quote:
Originally Posted by Misfire View Post
OK, now I'm no EE, but I have had electrical class's, what make's heat? currant flow, (amps) if cut in half, should drop temp's with same powr usage!
Well I am an EE and I'm telling you that its not worth the trouble. Like I stated earlier you may gain a small amount in efficiency but thats about it. As fas heat is concerned, most small electronics such as microcontrollers and switching regulators are rated by junction temperature (TJ) in degrees C per watt. It goes by the total power dissipated by the device. So the power here is not changing(Power= current X volts) so the thermal coefficients will most likely still be the same.
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post #13 of 15
Quote:
Originally Posted by Misfire View Post
OK, now I'm no EE, but I have had electrical class's, what make's heat? currant flow, (amps) if cut in half, should drop temp's with same powr usage!
No... You are doubling voltage but halfing the current.

10A * 120v = 1200w
5A * 240v = 1200w


In your case, you are improving the PSU efficency by a few percentage points. This will reduce the heat dump by the PSU.


i.e. If your system needed 500W and the PSU was running at 85% efficency, the PSU would be generating ~88w of waste heat. Moving the system to 240v would improve efficency by say 3%. So your 500w system is on a 88% efficency would reduce waste heat by 20w.
Once again...
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Once again...
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post #14 of 15
Thread Starter 
OK,OK, It's not worth it, leaving it alone! but thats why I'm here, to learn from the higher up's. Ya can't shoot me down for keeping the gears churnin in the ole knoggen!
alway's looking to improve on thing's, he,he
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post #15 of 15
Yup, 240v would improve your PSU efficiency by 1-5%.
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