2008/10/24 Len Gerstel <[EMAIL PROTECTED]>: > > > On Oct 24, 2008, at 10:54 AM, hackmiester / Hunter Fuller wrote: > >> >> 2008/10/24 Steve R <[EMAIL PROTECTED]>: >>> >>> At 9:58 AM -0400 10/24/08, Len Gerstel posted: >>>> So a USB device that is on, whether it is a printer with the power >>>> switch turned on or a mouse waiting to be moved, will draw power. A >>>> USB device that is not turned on like a printer or scanner with the >>>> power switch turned off or power brick unplugged will not draw any >>>> usb power. >>> >>> Immensely. Thanks. >> >> I have one other correction: Devices like printers don't draw any >> power when on, either - from USB at least. At least on my printer, the >> USB power lines aren't even connected > > My thought was about the miniscule amount of power that is used when > the printer is powered up and is polling the computer over the USB > lines. > > It sends a signal to the computer asking "anything for me to print > yet? I am still here and powered on." > > Maybe the print command is a pure push command from the computer with > no polling on the part of the printer, so the printer's USB is woken > up by the signal to print. > > But, overall, even when printing, a printer with a power brick will > use a miniscule, but not zero, amount of power compared to a mouse or > keyboard.
Well, sure... but it's negligible. Like, barely measurable. > > Len > > > > > -- -hackmiester --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed Low End Mac's G3-5 List, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/g3-5-list?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
