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.

In article ,
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.

Volts o/p is a specification. Amps o/p is a maximum capability.
So if you have a wall wart rated 5 volts & 1.8 amps, it can be use for
anything that wants 5 volts and up to 1.8 amps. Your 1 amp Iphone will
run fine, just a bit cooler.

Exception: If the Kindle charger is poorly designed, it MAY need the
full 1.8 amp o/p to pull the voltage down to 5. Measure the voltage it
puts out when connected to the Iphone.

--
Rich Greenberg Sarasota, FL, USA richgr atsign panix.com + 1 941 378 2097
Eastern time. N6LRT I speak for myself & my dogs only. VM'er since CP-67
Canines: Val,Red,Shasta,Zero,Casey & Cinnar (At the bridge) Owner:Chinook-L
Canines: Red & Max (Siberians) Retired at the beach Asst Owner:Sibernet-L

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.

In article ,
Rich Greenberg wrote:
In article ,
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.

Volts o/p is a specification. Amps o/p is a maximum capability.
So if you have a wall wart rated 5 volts & 1.8 amps, it can be use for
anything that wants 5 volts and up to 1.8 amps. Your 1 amp Iphone will
run fine, just a bit cooler.

No cooler; the iPhone will draw it's usual amount of current (if the
adapter can supply it, which should be no problem in this case) and will
dissipate the same amount of heat. If it's noticably warmer or cooler,
then something is wrong.

Exception: If the Kindle charger is poorly designed, it MAY need the
full 1.8 amp o/p to pull the voltage down to 5. Measure the voltage it
puts out when connected to the Iphone.

No, voltage is what's regulated and should be stable over the full range
of current draw. Unregulated wall warts haven't been made for years; the
newer switching power supplies are much better at regulating and much
lighter weight as well.


Gary