Q. Hi,
I bought PowerGen 3.1A Wall Charger, when I use with original Micro USB cable that come with my Samsung Galaxy S4, the charging current is 1.9A, when I use with a generic USB cable, the charging current is only 700mA. (I have a way to test the charging current)
Does anyone know which Micro USB cable that carry fast current, such as 1.9A like original USB Cable that come with S4, or even better, carry up to 3.1A that this Wall charger provides?
Thanks All.
A. One - it is not a "charger", it is simply a power supply. The battery charge control circuit is inside the phone.
Two - re. the 3.1A, you can't do that. The power supply acts like a (nearly) constant-voltage supply and the phone presents an effective series resistance, resulting in current E/R. The only way to force more current into the phone would be to increase the voltage output from the supply. This would likely burn up something in the phone - maybe the battery.
Think about it: Some of the outlets in your house are likely 20 amp outlets, wired with 12 gauge wire. Others are 15 amps, wired with 14 gauge (smaller) wire. Will a 100 watt light bulb draw more current, hence more power, hence give more light, on a 20 amp outlet vs. a 15 amp? Of course not. The outlet supplies 110 to 120 volts, the bulb has an effective resistance when running up a little more than 100 ohms, resulting in a little less than an amp of current and so a power usage of 100 watts. It doesn't matter how much current the outlet can supply, as long as it's at least as much a the load requires.
Regarding your 700 mA problem - that would have to be one very poor piece of USB cable to limit current in that way. Let's do the numbers...
Assuming the Samsung cable had 0 ohms resistance, then if the phone is pulling 1.9A at 5 volts, it has an effective resistance of just 2.6 ohms.
5 volts at 0.7 A would require a total R of 7.14... call it 7 ohms. So the generic cable would have to be adding 4.4 ohms to the path. Or 2.2 ohms per side (2.2 on the +5 side and 2.2 on the ground side).
Even if it's #30 wire, it would have to be 22 feet long to add 4.4 ohms to the path! (#30 is about 0.1 ohm/foot)
But, you could just try looking for the fattest Micro USB cable you can find and see what happens.
Keep in mind that current to a phone is not only charging current.. the phone uses different amounts of current at different times, depending on screen on or off, network conditions, etc... and even battery charging current varies a LOT over time. I wonder if the real issue here isn't simply a change in conditions between measurements.
Is there a website where I can watch/download movies on a Samsung Galaxy Tab 2.0 7?
Q. I have a samsung tablet and there are a few movies I want to watch online. Are there any websites ican watch or download movies?
A. Amazon or Google Play. Maybe Crackle or Vudu have apps.
How to attach a flash drive to Samsung Galaxy Tab 2 7" Tablet with 8GB Memory?
Q. I found an Android at Best Buy,
I am wondering if anyone is familiar with it.
How would I attach a flash drive to this kind of device?
Is it possible?
Can I transfer files from the flash drive to the desktop of this Android tablet?
Also, the store worker told me that the Samsung Galaxy Tab 2 Android does not have the "Word Document" feature like a notebook or laptop computer would but it has a different version of the same function and that I can type some letter or written drafts onto some "page" and save it on the desktop just like I would do with a Word document on a regular computer.
He said that it just has a different name.
What would that name be instead of "Word Document"?
A. For the usb drive you will apparently need a conversion cable like this one :
http://www.ebay.com/itm/USB-Host-OTG-Adapter-Cable-for-Samsung-Galaxy-Tab-2-7-0-7-GT-P3113-10-1-P5100-/300701824535
As for the word application , my favourite is Kingsoft Office, that is free and compatible with MS Office
https://play.google.com/store/search?q=kingsoft+office
Also if you install google drive, you will be able to save documents onto a free online / local storage that will automatically synchronize documents across online, tablet, and desktop.
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Title : What Micro USB cable that provide fast charging?
Description : Q. Hi, I bought PowerGen 3.1A Wall Charger, when I use with original Micro USB cable that come with my Samsung Galaxy S4, the charging curr...