Question

 How does an USB device tell apart a Wall socket from a computer port?

Answer USB has 4 connections. 2 them are 5 volt power and ground. The other 2 are the data connections. When you plugged your flash drive into the charger it received power in the right places but no data... Read More »
http://answers.yahoo.com/question/index?qid=20130414171427AA0t6a0

Top Q&A For: How does an USB device tell apart a Wall socket...

Is it true that any USB port on your computer can be used for either an output device or input device?

Yep you should have no issues with a usb printer. Just make sure to follow the directions for the software that comes with the printer. You may need to find drivers if you are running Win98 or WinM... Read More »
http://answers.yahoo.com//question/index?qid=20061208095439AAliMuN

Why won't my computer recognize a device in my VGA port?

Look at your Function Keys (F1-F12) at the top of the keyboard for the hot-key for video output. (It looks like a stick-figure of a monitor.) Press the blue function key at the bottom of the keyb... Read More »
http://answers.yahoo.com//question/index?qid=20120827125258AAzDjLJ

Can I turn my computer off at the wall socket at night?

course you can as long as its shut down properly each time. You will not lose data.
http://answers.yahoo.com//question/index?qid=20071114051213AABKMxd

Does a plug socket use electricity if it is switched on at the mains but no device attached to it?

Normally, it will not. Unless, the plug has some on/off indicator running off the electricity; in this case the electricity consumed should be very, very negligible. The other possibility of electr... Read More »
http://answers.yahoo.com/question/index?qid=20070220041718AA1ZOpF


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