Frank wrote:

Does it make any difference on output amperage if output voltage is
the same in wall plug/USB charger adapters? Referring to 1 amp vs
1.8 amps. Former is for iPhone & latter for Kindle Fire HD. Was
hoping to use one of these adapters rather than having to buy another
one for Samsung Intensity II phone. Both have 5 volts output.

Virtually any USB charger can be used for any USB-compatible device,
since the output voltage should be consistent.

However, if your device wants 5 amps for normal charging, the charger
with 1.8 amps max will take 3 times as long, or more. Also, you may
not be able to charge and operate the device at the same time.