Q. I have a Samsung galaxy phone wall charger that says it will work 100-250V 50-60 Hz. Does that mean that I can use the wall charger as a USB charger for any device that needs USB charging when I am travelling to a different country with 220V power? If I can do with one charger for all my 1.0A devices then I prefer that. Obviously I am asking the question for when I am travelling outside the US (110 V) to countries that have 220 V. I will use the appropriate prong adapter for the country. Just want to know if I can use the same USB charger for all 1.0A devices with 220V input.
A. yes you can as long as the output of the charger matches the same voltage of the device to be charged..!!
so if for example your charger output voltage is 5 volts then the device input also should be 5 volts.!! some devices might accept a lower or higher voltage but it's not good for the device's battery.
What Micro USB cable that provide fast charging?
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.
how can I make my android phone charge faster?
Q. so i just got an android for metro pcs it is the samsung galaxy indulge. and I use the wall charger yet it seems to take forever to charge. like it takes 4 hours to charge. and most other phones seem to take about an hour to two hours anyone know what I can do? because it also doesn't have a good battery life so I need to be able to charge it throughout the day and not have a dead phone.
A. Turn the phone off, or end all processes including 3G.
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Title : Can I use my Samsung phone USB charger to charge other USB devices when I am travelling?
Description : Q. I have a Samsung galaxy phone wall charger that says it will work 100-250V 50-60 Hz. Does that mean that I can use the wall charger as a...