This reply is indented to be canonical reply for related questions and applies to all gadgets that make the most of USB (Sort A or C) chargers and conform to the USB Energy Supply specification (model 2.x by way of 3.x).
If there may be solely the MacBook 12 inch USB-C charger close by, can it’s used to cost different USB-C gadgets, comparable to any Android telephones that additionally use USB-C? (will it’s “too highly effective” and harm different gadgets?)
Sure, it may be used and you’ll not trigger any harm.
USB-C conforms to the USB 3.1 specification. A part of that specification is the Energy Supply spec. Because of this the machine and charger will negotiate the ability that’s delivered.
As as to whether a charger is simply too highly effective or not, you may at all times use a charger better than or equal to the utmost energy draw of the machine. This is applicable to all chargers (USB, barrel connector, and so forth.), not simply people who conform to the USB 3.x specification.
In different phrases, in case your Apple USB-C charger is able to delivering 87W of energy, however you solely want 10W in your cellphone, you may cost your cellphone with no drawback.
Nonetheless, your 10W cellphone charger shouldn’t be used to cost your 87W MacBook. Why?
- If it is USB 3.x (USB Sort C), it would negotiate energy. Because it technically would not have sufficient, it would both cost slowly or under no circumstances.
- If it is USB 2.x (USB Sort A) or a daily kind charger, it would both not cost or have the potential for damaging the charger as a result of the draw of the machine will exceed the charger’s capacity.
(MagSafe energy adapters have a chip constructed into it to stop utilizing an underpowered charger).
Vice versa, if there’s a Fast Cost 2.0 or 3.0 USB-C charger from different gadgets close by, can it’s used to cost the Macbook 12 inch?
Presumably. The facility supply spec permits for energy negotiation. If there may be adequate energy, it would cost, albeit slowly. It might cost, however not energy your machine. It might do nothing (it could not agree on a negotiated energy supply so it stopped delivering energy). If it is a poor high quality charger (and doesn’t conform to USB 3.0+ spec) it could overheat.
That is why you at all times use chargers better than or equal to your machine load.
