Discussion:
wall plug in/usb charger
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Frank
2013-09-06 12:22:34 UTC
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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.
Rich Greenberg
2013-09-06 16:02:15 UTC
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Post by Frank
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.
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Eastern time. N6LRT I speak for myself & my dogs only. VM'er since CP-67
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Gary Heston
2013-09-07 13:44:39 UTC
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Post by Rich Greenberg
Post by Frank
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.
Post by Rich Greenberg
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

John Weiss
2013-09-06 18:44:25 UTC
Permalink
Post by Frank
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.
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