Is it more energy efficient to charge a phone/tablet using a desktop/laptop while your computer is being used vs using the charger?
I was just thinking if you are on your computer anyway would it just use some of the excess electricity that your computer would have wasted or would it be worse than charging your phone from a charger while using your laptop separately.
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It'll depend on how efficient your phone charger is vs your PC PSU. Looking at some charts, it's a very close battle but generally the phone charger seems to win out. Probably because it's more optimized for its max power output, whereas the PSU needs to support a wider range of loads.
https://silentpcreview.com/power-lost-a-better-way-to-compare-psu-efficiency/
https://www.electronicdesign.com/technologies/power/whitepaper/21129264/gan-fulfills-promise-of-efficiency-and-simplified-power-adapter-design
Are we still doing phrasing?
Interesting.