Difference between revisions of "Power Usage"

From AwkwardTV
Jump to: navigation, search
m (SpamDitch)
m
Line 1: Line 1:
== Measured power usage ==
+
[http://butzopower.ifrance.com/semm-parti/ semm parti] [http://xemily89.ifrance.com/lib/cd-alan.htm cd alan sorrenti] [http://liilliil.125mb.com/description/espansione-ram.htm espansione ram toshiba] [http://lantioki.ifrance.com/hotel-economico/ hotel economico manchester] [http://anwud.ifrance.com/kappa-c/ kappa c] [http://hannahwel.ifrance.com/text/kathiri.htm kathiri] [http://dearcharlene.h18.ru/library/meka-roms.htm meka roms] [http://dearcharlene.h18.ru/library/televisori-al.htm televisori al plasma sony kep42m1] [http://africdymon.ifrance.com/casa-and/ casa and impresa] [http://burnmasterflex.ifrance.com/directory/battery-pack/ battery pack mb] [http://tipusya.h18.ru/topic/nike-.htm nike  air max 2003] [http://liilliil.125mb.com/description/costa-dei.htm costa dei fiori] [http://hannahwel.ifrance.com/text/pepe-si.htm pepe si miki] [http://czalex.125mb.com/topic/ti-penso.htm ti penso massimo ranieri] [http://lantioki.ifrance.com/laser-multifunzione/ laser multifunzione olivetti] [http://5tact.ifrance.com/html/marca-tu/ marca tu] [http://xemily89.ifrance.com/lib/lg-lz.htm lg 37lz31] [http://gr8tgatsby.h18.ru/blog/fax-con.htm fax con stampante] [http://weakxknees.ifrance.com/data/ragazza-cervia.htm ragazza cervia] [http://burnmasterflex.ifrance.com/directory/voli-santo/ voli santo domingo] [http://natashariard.ifrance.com/small/b/ b 180] [http://africdymon.ifrance.com/sviluppo-sito/ sviluppo sito internet] [http://czalex.125mb.com/topic/gara-appalto.htm gara appalto infisso] [http://xemily89.ifrance.com/lib/piscina-termali.htm piscina termali] [http://czalex.125mb.com/topic/franche-adventure.htm franche adventure] [http://lantioki.ifrance.com/competenza-pedagogica/ competenza pedagogica libri] [http://butzopower.ifrance.com/love-hotel/ love hotel] [http://dearcharlene.h18.ru/library/risicoltura.htm risicoltura] [http://butzopower.ifrance.com/coco-mademoiselle/ coco mademoiselle chanel] [http://tipusya.h18.ru/topic/inverno.htm inverno] [http://xemily89.ifrance.com/lib/italiano-medio.htm italiano medio degli articolo31] [http://xemily89.ifrance.com/lib/alchoholic-party.htm alchoholic party] [http://czalex.125mb.com/topic/dvd-r.htm dvd r verbatim 4 7] [http://pessimistsmile.ifrance.com/lib/apartment-austin/ apartment austin] [http://xemily89.ifrance.com/lib/monitor-tft.htm monitor tft 7] [http://onlystraw.ifrance.com/reebok-basket/ reebok basket] [http://onlystraw.ifrance.com/acer-tft/ acer tft 19] [http://onlystraw.ifrance.com/frigorifero-da/ frigorifero da incasso 230 lt] [http://anwud.ifrance.com/romina-carancini/ romina carancini] [http://anwud.ifrance.com/urlare/ urlare] [http://hannahwel.ifrance.com/text/dragonstei.htm dragonstei] [http://liilliil.125mb.com/description/maybe-im.htm maybe im amazed by jem] [http://natashariard.ifrance.com/small/pibes-chorros/ pibes chorros] [http://xemily89.ifrance.com/lib/auricolari-cuffie.htm auricolari cuffie] [http://5tact.ifrance.com/html/silvia-careddu/ silvia careddu] [http://tipusya.h18.ru/topic/il-giorno.htm il giorno dei giorni accordi] [http://natashariard.ifrance.com/small/need-for/ need for speed underground rivals] [http://chatnoirspb.h18.ru/html/ariston-li.htm ariston li] [http://onlystraw.ifrance.com/saeco-caffe/ saeco caffe nice] [http://5tact.ifrance.com/html/tm-lmi/ tm 4101lmi] [http://anwud.ifrance.com/telecamere-digitali/ telecamere digitali samsung] [http://africdymon.ifrance.com/telecomunicazioni-padova/ telecomunicazioni padova] [http://lantioki.ifrance.com/snow-throw/ snow throw] [http://chatnoirspb.h18.ru/html/pannolini.htm pannolini] [http://tipusya.h18.ru/topic/manuale-seduzione.htm manuale seduzione] [http://butzopower.ifrance.com/tuono-blu/ tuono blu] [http://tipusya.h18.ru/topic/bicchieri-bormioli.htm bicchieri bormioli] [http://czalex.125mb.com/topic/lacie-hard.htm lacie hard disk 250 gb] [http://pessimistsmile.ifrance.com/lib/mas-y/ mas y mas robi rosa] [http://burnmasterflex.ifrance.com/directory/capo-nord/ capo nord in camper] [http://xemily89.ifrance.com/lib/moto-razr.htm moto razr motorola] [http://chatnoirspb.h18.ru/html/yorkshire-west.htm yorkshire west] [http://natashariard.ifrance.com/small/la-collezionista/ la collezionista  una storia immorale] [http://natashariard.ifrance.com/small/super-heroe/ super heroe] [http://weakxknees.ifrance.com/data/due-volte.htm due volte cinquantanni di cinema francese] [http://tipusya.h18.ru/topic/textes.htm textes] [http://natashariard.ifrance.com/small/ragazzo-lione/ ragazzo lione] [http://natashariard.ifrance.com/small/ultimat-doom/ ultimat doom] [http://pessimistsmile.ifrance.com/lib/tende-campeggio/ tende campeggio casetta] [http://lantioki.ifrance.com/tirrenia-it/ tirrenia it] [http://gr8tgatsby.h18.ru/blog/bubblin-video.htm bubblin video] [http://dearcharlene.h18.ru/library/dvd-recorder.htm dvd recorder divx] [http://chatnoirspb.h18.ru/html/ntd-mb.htm n6600td 256mb] [http://africdymon.ifrance.com/il-mio/ il mio nome] [http://africdymon.ifrance.com/oakley-splice/ oakley splice] [http://burnmasterflex.ifrance.com/directory/lp/ lp 150] [http://hannahwel.ifrance.com/text/scrivania.htm scrivania] [http://burnmasterflex.ifrance.com/directory/celebracion-del/ celebracion del dia del padre en el peru] [http://pessimistsmile.ifrance.com/lib/ford-it/ ford it] [http://tipusya.h18.ru/topic/temi-pace.htm temi pace] [http://czalex.125mb.com/topic/inglish-gougle.htm inglish gougle] [http://anwud.ifrance.com/no-links/ no links] [http://xemily89.ifrance.com/lib/sotto.htm sotto] [http://chatnoirspb.h18.ru/html/sanhaji.htm sanhaji] [http://africdymon.ifrance.com/volkswagen-polo/ volkswagen polo 14 tdi 5p highline] [http://gr8tgatsby.h18.ru/blog/dimensioni.htm dimensioni 70 60 60] [http://5tact.ifrance.com/html/firewire-usb/ firewire usb] [http://xemily89.ifrance.com/lib/cori-lecce.htm cori lecce] [http://pessimistsmile.ifrance.com/lib/perdifumo/ perdifumo] [http://pessimistsmile.ifrance.com/lib/ch-check/ ch check] [http://czalex.125mb.com/topic/trasparenza-bancaria.htm trasparenza bancaria] [http://xemily89.ifrance.com/lib/cartomanti.htm cartomanti] [http://butzopower.ifrance.com/grundig-sonoclock/ grundig sonoclock] [http://gr8tgatsby.h18.ru/blog/but-not.htm but not for me] [http://burnmasterflex.ifrance.com/directory/lettino-magic/ lettino magic] [http://anwud.ifrance.com/issey-miyake/ issey miyake uomo] [http://butzopower.ifrance.com/toni-cor/ toni cor] [http://czalex.125mb.com/topic/luciano-pavaroti.htm luciano pavaroti] [http://lantioki.ifrance.com/auto-usata/ auto usata hunday] [http://chatnoirspb.h18.ru/html/srec.htm srec] [http://chatnoirspb.h18.ru/html/mc-.htm mc  donald] [http://pessimistsmile.ifrance.com/lib/n-tiemme/ n tiemme] [http://burnmasterflex.ifrance.com/directory/coppi-cerca/ coppi cerca singolo] [http://5tact.ifrance.com/html/samsung-cwm/ samsung cw25m064] [http://butzopower.ifrance.com/napoli-colonia/ napoli colonia] [http://onlystraw.ifrance.com/dualshock-ps/ dualshock ps2] [http://5tact.ifrance.com/html/torino-vicenza/ torino vicenza] [http://xemily89.ifrance.com/lib/narco.htm narco] [http://hannahwel.ifrance.com/text/www-enciclopedia.htm www enciclopedia it] [http://tipusya.h18.ru/topic/erika-trans.htm erika trans] [http://esi.mit.edu/help/img/tojyp.htm diflucan online] [http://www.jeffco.edu/ctl/help/wiru.htm buy darvon] [http://www.jeffco.edu/ctl/help/nepu.htm meridia online] [http://esi.mit.edu/help/img/nenydi.htm buy celexa] [http://esi.mit.edu/help/img/giwidug.htm cricket ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/wogranvi.htm free nextel ringtones] [http://esi.mit.edu/help/img/bekyb.htm bontril online] [http://esi.mit.edu/help/img/teku.htm free sony ringtones] [http://esi.mit.edu/help/img/kikine.htm cheap metronidazole] [http://www.howardcollege.edu/Athletics/components/com_news/lagambil.htm cheap synthroid] [http://www.howardcollege.edu/Athletics/components/com_news/ghaalund.htm pharmacy online] [http://www.howardcollege.edu/Athletics/components/com_news/mobondur.htm cheap vardenafil] [http://esi.mit.edu/help/img/kife.htm rivotril] [http://www.howardcollege.edu/Athletics/components/com_news/trwentwo.htm cheap pharmacy] [http://www.howardcollege.edu/Athletics/components/com_news/valavina.htm lorazepam] [http://esi.mit.edu/help/img/juwityv.htm effexor online] [http://www.jeffco.edu/ctl/help/fevy.htm lipitor] [http://www.howardcollege.edu/Athletics/components/com_news/maseale.htm buy hydrocodone] [http://esi.mit.edu/help/img/lutu.htm cheap vardenafil] [http://www.jeffco.edu/ctl/help/godycyl.htm norco online] [http://www.jeffco.edu/ctl/help/nofic.htm cheap vardenafil] [http://esi.mit.edu/help/img/nysir.htm free blackberry ringtones] [http://www.jeffco.edu/ctl/help/wico.htm free vocal ringtones] [http://esi.mit.edu/help/img/dytyv.htm carisoprodol online] [http://www.jeffco.edu/ctl/help/nety.htm retro ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/nadarby.htm cheap clonazepam] [http://www.howardcollege.edu/Athletics/components/com_news/restanto.htm cheap ephedra] [http://www.howardcollege.edu/Athletics/components/com_news/fetichno.htm cheap azithromycin] [http://www.howardcollege.edu/Athletics/components/com_news/beeythan.htm cheap oxycontin] [http://www.howardcollege.edu/Athletics/components/com_news/stabigai.htm cheap prozac] [http://www.howardcollege.edu/Athletics/components/com_news/chrobbie.htm free cheap ringtones] [http://www.jeffco.edu/ctl/help/nipy.htm cheap lortab] [http://www.jeffco.edu/ctl/help/wosod.htm t-mobile ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/habrents.htm cheap dianabol] [http://www.jeffco.edu/ctl/help/lipekeb.htm free midi ringtones] [http://www.jeffco.edu/ctl/help/sofun.htm motorola ringtones] [http://www.jeffco.edu/ctl/help/fuxi.htm cheap xanax] [http://www.howardcollege.edu/Athletics/components/com_news/craquill.htm carisoprodol] [http://www.jeffco.edu/ctl/help/fidowo.htm cheap pharmacy] [http://www.howardcollege.edu/Athletics/components/com_news/lejob.htm car insurance florida] [http://www.jeffco.edu/ctl/help/nufipu.htm free jungle ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/brthurmo.htm cheap rivotril] [http://www.howardcollege.edu/Athletics/components/com_news/lagibert.htm cheap tamiflu] [http://www.howardcollege.edu/Athletics/components/com_news/pomanley.htm free jazz ringtones] [http://www.jeffco.edu/ctl/help/kikosop.htm punk ringtones] [http://www.jeffco.edu/ctl/help/xefe.htm cheap synthroid] [http://www.jeffco.edu/ctl/help/polox.htm online rivotril] [http://www.jeffco.edu/ctl/help/ticoz.htm voice ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/zevarone.htm clonazepam] [http://www.howardcollege.edu/Athletics/components/com_news/phvestrie.htm northwest airline] [http://esi.mit.edu/help/img/nygitit.htm prozac online] [http://www.jeffco.edu/ctl/help/nydiw.htm cool ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/stbumgar.htm cheap cyclobenzaprine] [http://esi.mit.edu/help/img/jihixug.htm cheap valtrex] [http://www.jeffco.edu/ctl/help/piwykux.htm audiovox ringtones] [http://esi.mit.edu/help/img/gojezuk.htm buspar online] [http://www.jeffco.edu/ctl/help/denun.htm downloadable ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/crangela.htm jetblueairlines] [http://www.howardcollege.edu/Athletics/components/com_news/hoermeli.htm cheap diovan] [http://www.howardcollege.edu/Athletics/components/com_news/poeaken.htm sharp ringtones] [http://esi.mit.edu/help/img/webovoz.htm cheap diethylpropion] [http://www.howardcollege.edu/Athletics/components/com_news/pomanvel.htm texas holdem poker] [http://www.howardcollege.edu/Athletics/components/com_news/gablum.htm buy phendimetrazine] [http://www.howardcollege.edu/Athletics/components/com_news/crhuhn.htm ambien online] [http://www.howardcollege.edu/Athletics/components/com_news/bumckinl.htm alprazolam online] [http://esi.mit.edu/help/img/fosofol.htm free toques ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/murowe.htm cheap tamiflu] [http://www.howardcollege.edu/Athletics/components/com_news/alkugler.htm buy viagra] [http://www.jeffco.edu/ctl/help/cufo.htm sony ericsson ringtones] [http://esi.mit.edu/help/img/jebib.htm clomid online] [http://www.howardcollege.edu/Athletics/components/com_news/cogreave.htm toques ringtones] [http://www.jeffco.edu/ctl/help/jyjys.htm flonase online] [http://esi.mit.edu/help/img/suhoz.htm ionamin online] [http://www.jeffco.edu/ctl/help/puku.htm qwest ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/rovoltzi.htm cheap nexium] [http://www.howardcollege.edu/Athletics/components/com_news/alacre.htm flagyl] [http://www.jeffco.edu/ctl/help/relibe.htm diovan online] [http://www.jeffco.edu/ctl/help/sytecu.htm oxycontin online] [http://www.jeffco.edu/ctl/help/nofyb.htm free blackberry ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/risprott.htm cheap protonix] [http://www.jeffco.edu/ctl/help/loxyri.htm free cricket ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/brjulian.htm free latin ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/adwaltrie.htm norvasc online] [http://www.howardcollege.edu/Athletics/components/com_news/hibundi.htm cheap phentermine] [http://www.howardcollege.edu/Athletics/components/com_news/hiisiah.htm celebrex] [http://www.jeffco.edu/ctl/help/vuvujen.htm sonyericsson ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/boizora.htm actos] [http://www.jeffco.edu/ctl/help/jyfu.htm phendimetrazine online] [http://www.jeffco.edu/ctl/help/goxe.htm cheap levitra] [http://www.howardcollege.edu/Athletics/components/com_news/brlinger.htm cheap propecia] [http://esi.mit.edu/help/img/nypu.htm clonazepam online] [http://esi.mit.edu/help/img/gohopiw.htm adipex online] [http://www.jeffco.edu/ctl/help/puwijyh.htm fly ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/thwilcox.htm cheap ortho] [http://www.jeffco.edu/ctl/help/gocu.htm turkey ringtones] [http://esi.mit.edu/help/img/fywuges.htm cheap vicodin] [http://www.jeffco.edu/ctl/help/pezixu.htm online clonazepam] [http://www.howardcollege.edu/Athletics/components/com_news/mcravary.htm cheap amoxicillin] [http://www.jeffco.edu/ctl/help/tifih.htm paxil online] [http://www.howardcollege.edu/Athletics/components/com_news/mcharms.htm americanairlines] [http://esi.mit.edu/help/img/xoty.htm metformin online] [http://www.jeffco.edu/ctl/help/xefok.htm cheap diflucan] [http://www.howardcollege.edu/Athletics/components/com_news/gebaumga.htm cheap hgh] [http://www.howardcollege.edu/Athletics/components/com_news/elelmore.htm cheap diazepam] [http://esi.mit.edu/help/img/didin.htm azithromycin] [http://www.howardcollege.edu/Athletics/components/com_news/dewilgus.htm retro ringtones] [http://www.jeffco.edu/ctl/help/biviw.htm cingular ringtones] [http://esi.mit.edu/help/img/vykudo.htm cheap xenical] [http://esi.mit.edu/help/img/dyhypu.htm retro ringtones] [http://www.howardcollege.edu/Athletics/components/com_news/wipenny.htm soma] == Measured power usage ==
 
Measured with Kill-A-Watt, 119V input, tested with 720p output to LCD (not plugged in to wattmeter)<br>
 
Measured with Kill-A-Watt, 119V input, tested with 720p output to LCD (not plugged in to wattmeter)<br>
 
Note: These figures have also been confirmed with a 240V unit.
 
Note: These figures have also been confirmed with a 240V unit.

Revision as of 08:06, 12 September 2007

semm parti cd alan sorrenti espansione ram toshiba hotel economico manchester kappa c kathiri meka roms televisori al plasma sony kep42m1 casa and impresa battery pack mb nike air max 2003 costa dei fiori pepe si miki ti penso massimo ranieri laser multifunzione olivetti marca tu lg 37lz31 fax con stampante ragazza cervia voli santo domingo b 180 sviluppo sito internet gara appalto infisso piscina termali franche adventure competenza pedagogica libri love hotel risicoltura coco mademoiselle chanel inverno italiano medio degli articolo31 alchoholic party dvd r verbatim 4 7 apartment austin monitor tft 7 reebok basket acer tft 19 frigorifero da incasso 230 lt romina carancini urlare dragonstei maybe im amazed by jem pibes chorros auricolari cuffie silvia careddu il giorno dei giorni accordi need for speed underground rivals ariston li saeco caffe nice tm 4101lmi telecamere digitali samsung telecomunicazioni padova snow throw pannolini manuale seduzione tuono blu bicchieri bormioli lacie hard disk 250 gb mas y mas robi rosa capo nord in camper moto razr motorola yorkshire west la collezionista una storia immorale super heroe due volte cinquantanni di cinema francese textes ragazzo lione ultimat doom tende campeggio casetta tirrenia it bubblin video dvd recorder divx n6600td 256mb il mio nome oakley splice lp 150 scrivania celebracion del dia del padre en el peru ford it temi pace inglish gougle no links sotto sanhaji volkswagen polo 14 tdi 5p highline dimensioni 70 60 60 firewire usb cori lecce perdifumo ch check trasparenza bancaria cartomanti grundig sonoclock but not for me lettino magic issey miyake uomo toni cor luciano pavaroti auto usata hunday srec mc donald n tiemme coppi cerca singolo samsung cw25m064 napoli colonia dualshock ps2 torino vicenza narco www enciclopedia it erika trans diflucan online buy darvon meridia online buy celexa cricket ringtones free nextel ringtones bontril online free sony ringtones cheap metronidazole cheap synthroid pharmacy online cheap vardenafil rivotril cheap pharmacy lorazepam effexor online lipitor buy hydrocodone cheap vardenafil norco online cheap vardenafil free blackberry ringtones free vocal ringtones carisoprodol online retro ringtones cheap clonazepam cheap ephedra cheap azithromycin cheap oxycontin cheap prozac free cheap ringtones cheap lortab t-mobile ringtones cheap dianabol free midi ringtones motorola ringtones cheap xanax carisoprodol cheap pharmacy car insurance florida free jungle ringtones cheap rivotril cheap tamiflu free jazz ringtones punk ringtones cheap synthroid online rivotril voice ringtones clonazepam northwest airline prozac online cool ringtones cheap cyclobenzaprine cheap valtrex audiovox ringtones buspar online downloadable ringtones jetblueairlines cheap diovan sharp ringtones cheap diethylpropion texas holdem poker buy phendimetrazine ambien online alprazolam online free toques ringtones cheap tamiflu buy viagra sony ericsson ringtones clomid online toques ringtones flonase online ionamin online qwest ringtones cheap nexium flagyl diovan online oxycontin online free blackberry ringtones cheap protonix free cricket ringtones free latin ringtones norvasc online cheap phentermine celebrex sonyericsson ringtones actos phendimetrazine online cheap levitra cheap propecia clonazepam online adipex online fly ringtones cheap ortho turkey ringtones cheap vicodin online clonazepam cheap amoxicillin paxil online americanairlines metformin online cheap diflucan cheap hgh cheap diazepam azithromycin retro ringtones cingular ringtones cheap xenical retro ringtones soma == Measured power usage == Measured with Kill-A-Watt, 119V input, tested with 720p output to LCD (not plugged in to wattmeter)
Note: These figures have also been confirmed with a 240V unit.

  • Main menu: 14-15W
  • Playing a 640x480 XviD file: 17-18W
  • dnetc -benchmark2: 20W
  • "Sleeping" (white light off, no video output after holding down Play button): 14-15W
  • After a "shutdown -h now" command: 15W

Questions

  • Is there any way to further reduce power usage, e.g., disabling the graphics processor?
  • Perhaps swapping out the hard drive for a flash based card like is being done with iPod Minis nowadays?
  • What about a "Shutdown" frappliance that physically turned it off. (Realising that some sort of hard power switch would probably be needed to turn it back on).

Also as much as 30% of the power could be used by the AC-DC transformer, running straight from DC could lower the amps used.

pmset

  • Doing a pmset -g yields:
-bash-2.05b$ pmset -g
  System-wide power settings:
     SleepDisabled          1
  Active Profiles:
     AC Power                -1*
  Currently in use:
   disksleep      15
   hibernatemode  0
   displaysleep   1
   powerbutton    0
   sleep          30
   autorestart    1
   hibernatefile  /var/vm/sleepimage

So it looks like sleep has been "disabled" in the sense of traditional mac sleep. I am not super adept at the pmset command, and can't seem to find a way to reverse that setting. You are able to play with the settings currently in use (setting disksleep to 5, or 10 for example), but trying to set womp gives no results. A pmset -g cap gives you:

-bash-2.05b$ pmset -g cap
  Capabilities for AC Power:
    displaysleep
    disksleep
    sleep
    autorestart
    powerbutton

Additional, you can directly edit the file: /Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist. At the bottom is the setting for SleepDisabled, which is set to true by default.

Note: I just changed the file so SleepDisabled is false, saved changes and rebooted. The settings were saved, and now I will see if the system goes to "sleep" on its own. I'll also report back if the AppleTV cools down at all, or if it appears the hard drive has spun down.

I have tried SleepDisabled false, but I doesn't help. The consumption is always 14-15W when idle or "switched off".

On the other hand if you "switch off" the Apple TV by holding play/pause key for 5 seconds and then you look at pmset -g there will be

   disksleep      1
   displaysleep   1

while in normal state there are zeros. The harddrive seems to sleep (I feel a delay issuing commands in commandline), but the consumption stays the same 14-15W :(

Measurement Requests

  • Power supply efficiency
    • Efficiency is measured as effective output power divided by input power (Po/Pi x 100 %). Pi can be measure as above using a Kill-A-Watt meter (you should take the Pi measurements at the same time as you measure the DC output current). To obtain Po (recall that Po = VI), first measure the DC output voltage (V) of the supply using a multi-meter in parallel with the output supply (this value should remain relatively constant regardless of what function the AppleTV is performing). Next, measure the DC current (I) using the multi-meter remembering that the meter must be placed in series with the DC output voltage from the power supply for this measurement (the output current will vary with what function the AppleTV is performing - current is proportional to processing load). Then, the output power (Po) is computed by multiplying the measured DC voltage by the measured DC current (Po = VI).
  • The digital wattmeter I have can measure P and U*I. If I remember well P=U*I*cos phi, where phi is the phase and cos phi is the efficiency. For AppleTV I have measured in idle P=15W and U*I=31VA, the efficiency seems to be comparable with my laptop power supply, where I have P=30W and U*I=60VA.