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[–] 2 pts

Setting aside the incompatibility of proprietary plugs used on consumer devices in the Western Markets; what you are saying is categorically false. Voltage and amperage have wide and various applications across a variety of devices. Confusing or being ignorant of those differences can and will cause device/battery failure, sometimes catastrophically causing burn out, melting of capacitors, or even combustion with certain types of lithium or ion batteries.

[–] 4 pts

Especially older versus newer adapters. The old heavy ones weren't usually regulated, so e.g. a 12V adapter would put out 17V open-circuit. Also a lot of them used negative-tip polarity instead of the near standard positive-tip now used. Then the older device would use an inefficient linear regulator. Some devices like routers (that I've seen) still use an internal (switching) regulator so you can feed them with more than 12V, but others expect regulated voltage.

Newer lightweight ones are almost all positive-tip and regulated. Cheapo devices have cheapo adapters which I wouldn't put on an expensive device. Also they tend to cut power when the current rating is exceeded, so for something needing a 2A 5V supply don't use your cheap 0.5A or 1A phone charger unless you want random device reset when it happens to actually need 2A.

[–] 1 pt

Huh? Never had it ever occur.

I'm lucky.

[–] 3 pts

It is worth being mindful of if you care about preserving the lifespan of power servos, motors and capacitors/alternators/adapters. Not saying it will cook them every time but it certainly can.

[–] 0 pt

Fair enough. I just never encountered a plug that plugged into something else that caused a problem in America.

we used to pop polycom phones at work all the time, plugged an ATA ac adapter (48volts) into the phones power (24v), makes a pop and smells like ass.

Honestly though, if you know how to read, this is easily avoided.