Charging a mobile using USB3 lead

[Deleted User]

spud17 wrote: »

What does your mains charger supply?

Those that come with tablets, are ~ 2.1A.

pappa_golf

correct , and usb 3 is 900ma


does anyone know if the phone will charge quicker on the mains charger or usb3 from a computer

spud17

Bedsit_Bob wrote: »

Those that come with tablets, are ~ 2.1A.

The waters are already muddied without you talking about tablet chargers.:)
We're trying to establish the output of the op's charger for his/her Galaxy S4.

pappa_golf

which according to a quick search is 2a

[Deleted User]

pappa_golf wrote: »

which according to a quick search is 2a

You are correct (just found one on Amazon), so the answer to the OP is yes, it will charge faster, when connected to the "standard adapter plug".

grumbler

Bedsit_Bob wrote: »

You are correct (just found one on Amazon), so the answer to the OP is yes, it will charge faster, when connected to the "standard adapter plug".

I think only "not slower" can be said with 100% certainty as the mains charger can be designed with excessive power/current compared to what the phone requires actually.

Otherwise, say, a 5A charger would charge the phone even faster.

londonTiger

Make sure the USB lead is genuine and not a gimmick toy one from eBay for £2. The charging speed of cheap lead us atrocious. They're cheaply made and have high resistance, probably because they don't use enough copper. Also obviously potential fire risk if it's too high resistance.

I got a lead from asda for £3 and it melted, I smelt burnt plastic in my room investigated and found the micro usb has melted

50Twuncle

londonTiger wrote: »

Make sure the USB lead is genuine and not a gimmick toy one from eBay for £2. The charging speed of cheap lead us atrocious. They're cheaply made and have high resistance, probably because they don't use enough copper. Also obviously potential fire risk if it's too high resistance.

I got a lead from asda for £3 and it melted, I smelt burnt plastic in my room investigated and found the micro usb has melted

Mine is actually a Belkin from Maplin ..

londonTiger

grumbler wrote: »

I think only "not slower" can be said with 100% certainty as the mains charger can be designed with excessive power/current compared to what the phone requires actually.

Otherwise, say, a 5A charger would charge the phone even faster.

As long as the volts are a match the device can draw as much amps as it needs. The only fault with having excessively high amps, say running a 12 led light straight off a car battery is the the current can spike and burn the device

paddyrg

londonTiger wrote: »

As long as the volts are a match the device can draw as much amps as it needs. The only fault with having excessively high amps, say running a 12 led light straight off a car battery is the the current can spike and burn the device

And so easy to protect against! A choke in line, a capacitor to ground, absolutely standard in any phone charging circuit