A good thing to keep in mind is that you should match voltages, but with amps the cord just has to be equal or higher than the device. It’s a rating of what the cord can provide, not what it’s spitting out at all times like voltage.
So in your example of 12v 900ma, a 12v cord thats 1a or greater should work fine assuming the barrel is the same. This can also help declutter anyone’s ‘collections’…if you have a whole mess of 12v cords, you can safely ditch the lower amp ones.
A good thing to keep in mind is that you should match voltages, but with amps the cord just has to be equal or higher than the device. It’s a rating of what the cord can provide, not what it’s spitting out at all times like voltage.
So in your example of 12v 900ma, a 12v cord thats 1a or greater should work fine assuming the barrel is the same. This can also help declutter anyone’s ‘collections’…if you have a whole mess of 12v cords, you can safely ditch the lower amp ones.