Instead of the sane approach of specifying 5, 9, 12, 15, and/or 20 volts and the amperages, products insist on listing every model of device in existence instead.
Most will do 12V, but I always want to make sure it’ll power my laptop (20V) as well.
A big thank you to reviewers who post images of the actual products where it shows the relevant info in one short line on the labels:
e.g. PD Output: 5V=3A, 9V=3A, 12V=3A, 15V=3A, 20V=3A
Potential or electromotive force. “Voltage” is long accepted. The only use of “amperage” you’ll find in The Art of Electronics is in the index: Amperage, see current. Ampère called current “intensité du courant”, hence I in V = I × R.
I don’t know why it bugs me. This is Mildly Infuriating… The place for nitpicking! 😅
Agreed, and thanks for the history lesson!