Delete comment from: Ken Shirriff's blog

Ken Shirriff said...

Hi Jimbo. That's an interesting question, if 240V makes a difference, so I tested the UK charger on 120 and 240 volts. With 120V, I could get at most 1.7W out of it, but with 240V I could get 2.2W. The higher input voltage helps some, but not a lot. Either way, the charger's output power is a lot lower than the 5W it is supposed to produce. By the way, the charger says it takes 100-240V input; a genuine charger will work just as well with 120 as 240.

May 30, 2016, 4:13:32 PM

Posted to A dozen USB chargers in the lab: Apple is very good, but not quite the best