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does USB cables attached to CPU consumes elec.?


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#1 natz17

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Posted 30 December 2008 - 11:02 PM

i'm just wondering if USB cables are consuming electricity even though they are not used.

just yesterday, i went to my friends house to show him something on the net. and as i
looked on his PC, there are many USB cables attached. and i wondered if it consumes electricty.

so does it consume electricty??

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#2 dc3

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Posted 31 December 2008 - 12:32 AM

If there isn't a device plugged into the port then there shouldn't be any power to the cable. There is a feature called selective suspend which when it perceives that there isn't a device attached will shut down power to the port.

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#3 DJBPace07

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Posted 31 December 2008 - 12:59 AM

Many things attached to a computer consumes electricity, USB cables not in use are not one of them. On a side note, it is always a good idea to power down a PC at night and turn off the power strip if you are able. Cell phone chargers also consume electricity when plugged in and not charging a phone.

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#4 natz17

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Posted 31 December 2008 - 02:44 AM

oh yeah.. that what i meant DJBPace07.

eventhough you are not using the cables, electricty is still consumed

#5 dpunisher

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Posted 31 December 2008 - 07:59 AM

You can go to Device Manager>Universal Serial Bus Controllers>USB Root Hub (more than one usually), and click on "Power" tab. It will tell approx how much each device is pulling.

Just having a cable plugged in won't use power.

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#6 natz17

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Posted 04 January 2009 - 02:17 AM

oh yeah.. thnx man! now i know if usb cables are consuming electricty.lol




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