How do you tell which AC adapter goes with which device?

Question

If the device says something like “DC-12V-IN”, will any 12V AC adapter with the correct connector work?

And why don’t they mark the adapter somehow so it’s obvious which device it goes with?

In: Technology

Answer 1

1 voltage matches exactly

2 device current (amps) is less than or equal to supply rated amps

3 the plug fits

If those are all good, it’s good to go.