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Posted to comp.mobile.android,comp.mobile.ipad,alt.home.repair
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Advice sought on why 6.8A USB charger melted USB cable today
"Danny D." writes:
I would just like some advice since I melted a USB cable today
and I realized I don't have the proper troubleshooting skills.
Here's what it says on the package:
"Smart USB Technology: This adapter automatically adjusts power
output to fit your charging device. Tablets and e-readers require
2 Amp charging, and this adapter will reroute power to the
appropriate USB port you use."
"Charging Combinations:
- 2 tablets + 3 mobile devices
- 1 tablet + 4 mobile devices
- 5 mobile devices
- 3 tablets"
I am confused about both the pure math and how this operates.
Q1: Since 6.8A times 5VDC is only 34Watts (not 40 Watts), how
can they very clearly label it as a 40Watt device?
http://www.powerstream.com/VA-Watts.htm
Q2: How does the device "know" to give tablets 2.4 Amps
(12 Watts) but a "mobile device" only 1Amp (5 Watts).
http://www.extremetech.com/computing...our-smartphone
Q3: What if a mobile device "wants" more than 1 amp?
Does the charger give more than 1A to the device?
Ask the manufacturer.
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