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KingsGambit
Caldari Knights
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Posted - 2008.11.08 19:00:00 -
[1]
(TAKE TWO - Stupid forum ate my post!) I wanted to ask for help with this from you folks as I'm not entirely sure about how it all works. While I can manipulate volts, amps, watts and wattnot (boooooo!) just fine, the concept of the 'kilowatt/hour' eludes me. I was having a discussion with a colleague about the cost of running PCs and without knowing, I was unable to really backup the points I was making.
I'm guessing that a kilowatt/hour (kw/hr) is the amount of electricity used by a 1,000W device were it left on for 1 hour. Though I don't know the actual amount I/we pay, let's assume it's ú0.10p per kw/hr. My PC at home has a 680W PSU. So if my guess is on track, I would calculate the cost of leaving my PC on for a day as follows:
680 (my PSU, in Watts) x 24 (hours) = 16,320 16,320 / 1,000 = 16.32 kw/hr 16.32 x ú0.10p = ú1.63p/day or ú0.07p/hour
Is that correct? And regardless, my other argument is that a PC only uses the power it needs at any given time. eg. My PC has two optical drives, two HDDs, a GFX card, a sound card and a NIC. If I were un-zipping a file between drives, copying a DVD on-the-fly and streaming a music video from the Net, then my PC is pretty much working at full capacity. However I argue that if my machine is idling, or I'm browsing the web without anything else running, my PC wouldn't be using 680W. I can't back that up though and hope some folks here can tell me whether either/both/neither of my assumptions above are right. Assuming PCs don't use full power while idling, is there a way to estimate how much power they actually use? -------------
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The TX
Gallente Pulsar Combat Supplies Alternative Realities
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Posted - 2008.11.08 19:04:00 -
[2]
BAD POST EATING FORUM! DOWN BOY! DOWN!!!!!!
Originally by: Slade Trillgon Holy wall of text TX-Man.
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Jana Clant
Errortech industries
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Posted - 2008.11.08 19:05:00 -
[3]
*shoots TX with a tranquilizer dart*
Join New Eden Research today and never worry about queues again!
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The TX
Gallente Pulsar Combat Supplies Alternative Realities
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Posted - 2008.11.08 19:11:00 -
[4]
*zzzzzzzzzzzzzzzzzzzzzzzzhchwerkhmmmthemonkeyatemyhomeworkhmmmzzzzzzzzzzzzzzzz*
Originally by: Slade Trillgon Holy wall of text TX-Man.
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Brea Lafail
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Posted - 2008.11.08 21:21:00 -
[5]
Important note: It's kilowatt x hours, not kilowatt/hour.
Other than that, calculations look right. I'd just assume the thing always consumes 680 watts, even if you know it doesn't.
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Baldour Ngarr
Aliastra
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Posted - 2008.11.08 21:32:00 -
[6]
You calclation is entirely correct, though as the above poster mentioned, writing is as kilowatt/hour makes it look like something you should divide, and it isn't. :)
As you probably know, one joule is the amount of energy consumed by a one-watt appliance in one second: J = W*T.
Kilowatt-hours is just another measurement of energy, but instead of 1*1, its 1000*3600. kWH = 3.6Mj.
(I think ... it's been a while. ) ________________________________________________
"I tried strip mining, but I lost, and it's cold flying around in space naked." |
TU144 TEPPOPNCT'CMEPTHNK
Caldari State War Academy
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Posted - 2008.11.09 01:53:00 -
[7]
dont forget that you got a monitor and the modem/router 's power requiremtns, and the desk / room lights.
rounded up i would expect it will be over ú5 per week just week. (for me i was running x2 pc's and ripping through ú10/w)
on average i found my system 700w psu + tft monitor was getting through about 300w when measured at the socket.
you can get lcd sockets that will show the power usage and can tell you your Kw/h rate.
CCP made little baby jesus cry by nerfing ghost training
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steveid
Killed In Action
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Posted - 2008.11.09 03:08:00 -
[8]
just as a FYI tool the average pc uses bout 50p a day if its left on. Also even if you switch of your pc if its still plugged in most of them use electric, albeit a small amount. I would advise buying yourself an energy monitor and plugging it in, see what your day usage / cost is.
Spoke to a guy who uses ú1100 a year electric and managed to reduce that by switching of stuff that he thought was off anyways but really isn't. Youd be suprised what uses electric even when its "off"
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KingsGambit
Caldari Knights
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Posted - 2008.11.10 10:32:00 -
[9]
Thanks all for the replies, I'm glad I'm not completely wrong, and have noted that it's a product, not a division. Still, I wish they'd just use joules already, that's a unit of measurement I can get on with Might look into that plug device to see how much power a PC draws. We've been asked to look into energy saving at work and trying to work out numbers for 700 PCs gives this gambit a headache -------------
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Etumretniw
Minmatar Sebiestor tribe
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Posted - 2008.11.10 11:14:00 -
[10]
Originally by: steveid just as a FYI tool the average pc uses bout 50p a day if its left on. Also even if you switch of your pc if its still plugged in most of them use electric, albeit a small amount. I would advise buying yourself an energy monitor and plugging it in, see what your day usage / cost is.
Seconded. I bought one of those, it tells me my IBM 335 server uses 10 W while turned off! A PC is probably way lower, but still..
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Akita T
Caldari Navy Volunteer Task Force
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Posted - 2008.11.10 11:15:00 -
[11]
The amount you pay also can be radically influenced by the kind of meter your house uses. If you have an old style "active power only" meter, you might be surprised to see your PC-related energy bills be far below expected values. Also, yeah, you're not always using the maximum your PSU can supply.
P.S. 1 watt = 1 joule / second Therefore, 1 kilowatthour = 3 600 000 joules
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Create a character || Fit a ship || Get some ISK |
FireFoxx80
Caldari E X O D U S Imperial Republic Of the North
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Posted - 2008.11.10 14:19:00 -
[12]
Yeah, those plug things are very useful. I think Amazon sell one, with the intelliplug in a bundle, for about ú35.
I now have all my AV equipment and consoles power-down when I turn off my amplifier.
What I do the rest of the time - Vote for a Jita bypass! |
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