Joseph, Thanks for putting in this effort. I realized after your first message that of course, the output voltage for a MacBook charger would be much higher than for an iPhone. The web page you sent confirms that it is nominally 20 Volts dc. This is required to charge the MacBook, regardless of what power in Watts may be listed. The higher wattage for any given voltage means more current available for charging. iPhones can be connected directly to a USB port or to their own brick. Whether that brick is a 12 Watt brick, or the smaller more familiar 5 Watt brick, their output voltage matches that for USB, which is nominally 5 Volts dc. Having a 12 Watt charger for an iPhone instead of a 5 Watt charger just means that the 12 Watt charger can deliver more current to the iPhone, if it is capable of handling it.
So my original question was pretty naive especially coming from an electrical engineer. Just hadn’t had enough caffeine before posting that. Dave Carlson Oregonian, Engineer, Musician, Farfar, Woodworker, and Pioneer On Nov 7, 2021, at 2:44 PM, Joseph Hudson <[email protected]> wrote: Actually Dave, I just did some googling and it's actually lower than what we thought. Here's the result that I just looked at below. So you could actually search for one of these. Mind you I don't have a new Mac yet. And it's still not something I'm not sure if I'm gonna do yet. https://www.ifixit.com/Answers/View/288059/What+is+the+voltage+from+the+charger+suppose+to+be > On Nov 7, 2021, at 2:12 PM, Dave Carlson <[email protected]> wrote: > > Joseph, oh, heck. I completely forgot to think about voltage. Pretty likely > the MacBook requires something in the range of 12 to 16 Vdc, and the phone > chargers are only around 5 Vdc. Thanks for the sanity realignment. > > Dave Carlson > Oregonian, Engineer, Musician, Farfar, Woodworker, and Pioneer > > On Nov 7, 2021, at 10:58 AM, Joseph Hudson <[email protected]> wrote: > > Dave, I will check the voltage on the battery before using that particular > block. That might make the Mac complain. > >> On Nov 7, 2021, at 12:10 PM, Dave Carlson <[email protected]> wrote: >> >> Anyone know if I would be able to charge a MacBook Pro using the 12 Watt >> charger that comes with the newer iPhones? I would of course buy a USB C / >> USB C cable for this purpose. And I know that it would charge more slowly, >> but don’e know if the MacBook would complain. >> >> Dave Carlson >> Oregonian, Farfar, Engineer, Musician, Pioneer, and Woodworker >> >> -- >> The following information is important for all members of the Mac >> Visionaries list. >> >> If you have any questions or concerns about the running of this list, or if >> you feel that a member's post is inappropriate, please contact the owners or >> moderators directly rather than posting on the list itself. >> >> Your Mac Visionaries list moderator is Mark Taylor. 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